You have 3 months, so make them count!

As many of you know, once Theros comes out, M13 and the Innistrad block will be rotating out of Standard. So that means we are losing about half of all the cards currently in Standard. So what can you do with all 8 sets now? Here are some fun decks to play with (which I made without the cards in hand. I'm pretty sure I have all the cards to make these decks, and I think these decks may work decently well):

Junk/Necra (White/Black/Green) Lifegain

Creatures x4 Soulmender x3 Child of Night x3 Vampire Nighthawk x4 Voracious Wurm x2 Archangel of Thune x1 Obzedat, Ghost Council Land x4 Temple Garden x2 Godless Shrine x2 Overgrown Tomb x2 Sunpetal Grove x2 Isolated Chapel x2 Woodland Cemetery x4 Plains x1 Forest x1 Swamp	Other Spells x2 Fog x4 Rancor x4 Divine Favor x2 Doom Blade x2 Mark of the Vampire x2 Angelic Accord x2 Alive//Well x2 Ready//Willing Planeswalkers x2 Sorin, Lord of Innistrad
Sideboard x2 Doomblade x4 Heroes' Reunion x4 Moment of Heroism x2 Thragtusk x3 Profit//Loss

Okay, so the main point of this deck is to get Archangel of Thune (AoT) out onto the battlefield to pump all your creatures with the life gain through other creatures and spells. Soulmender, of course, is used to trigger AoT's ability. Each one tapped individually triggers the ability. Then you have Child of Night and Vampire Nighthawk for lifelink, and Voracious Wurm is used as a large creature from the lifegain. Obzedat is used to drain life and then gain life, as well as potentially end the game in your favor.

All the spells are useful for pumping creatures, lifegain, avoid damage, or kill a creature. Sorin, Lord of Innistrad is used to permanently pump creatures through the emblem, or make a 1/1 lifelink vampire.

The sideboard is mainly here to provide all the things the mainboard couldn't hold within 60 cards, such as more Doomblades, lifegain with Heroes' Reunion, lifelink and pumping of creatures with Moment of Heroism, Profit // Loss for pumping your creatures and bring down opponent's creatures, and then Thragtusk for life and an additional creature once Thragtusk dies. These don't specifically help against other specific decks you may run into, just different strategies for this deck, between pump spells and extra lifegain.

Junk/Necra (White/Black/Green) Human Reanimator

Creatures x4 Champion of the Parish x4 Doomed Traveler x4 Blood Artist x4 Xathrid Necromancer x3 Bloodthrown Vampire x2 Angel of Glory's Rise x1 Archangel of Thune Land x2 Temple Garden x4 Godless Shrine x2 Overgrown Tomb x2 Sunpetal Grove x2 Isolated Chapel x2 Woodland Cemetery x2 Plains x4 Swamp	Other Spells x4 Fog x4 Rancor x4 Doomblade x4 Gather the Townsfolk Artifacts x2 Chalice of Life/Chalice of Death
Sideboard x4 Quag Sickness x3 Cartel Aristocrat x2 Fiendslayer Paladin x2 Silverblade Paladin x4 Giant Growth

So the main point of this deck is to pump Champion of the Parish, and create zombies when the humans die with Xathrid Necromancer. Once humans have died and you have zombie tokens, you then bring in Angel of Glory's Rise, sacrifice the zombies to Bloodthrone Vampire, as a result triggering Blood Artist's ability. As long as Archangel of Thune is on the field, for each create sacrificed, you can pump Bloodthrone Vampire with Archangel of Thune's ability plus Bloodthrone Vampire's ability. After sacrificing the zombies and returning the humans, you can sacrifice the humans and sacrifice the zombies again. Then you can attack with the vampires and angels. Rancor is used on Bloodthrone Vampire and Archangel of Thune in order to trample through opponent's creatures.

The sideboard is used for pumping creatures (Giant Growth, doublestrike with Silverblade Paladin), extra sacrifice outlets (Cartel Aristocrat), have more humans (Fiendslayer Paladin, Silverblade Paladin), and also have Quag Sickness to also kill large creatures used by opponents.

Izzet (Blue/Red) Spells

Creatures x4 Delver of Secrets x3 Augur of Bolas x4 Blistercoil Weird x3 Goblin Electromancer x2 Guttersnipe Land x4 Steam Vents x4 Sulfur Falls x4 Izzet Guildgate x4 Island x4 Mountain	Other Spells x2 Turn//Burn x4 Dynacharge x4 Izzet Charm x4 Talrand's Invocation x4 Teleportal x4 Skullcrack Planeswalkers x2 Ral Zarek
Sideboard x4 Ash Zealot x4 Frostburn Weird x4 Fog Bank x2 Chandra, the Firebrand x1 Turn//Burn

Yes, we're using Delver of Secrets... No Snapcaster Mage. All the creatures either assist with the casting of instants and sorceries or else revolve around revealing an instant or sorcery card. All the other spells are for creating creatures, pumping creatures, or dealing damage to your opponent(s). Ral Zarek is for tapping creatures or deals damage to your opponent.

The sideboard is for either extra defense or for dealing damage/copying instants and sorceries.

Naya (White/Red/Green) Combat Shenanigans

Creatures x4 Doomed Traveler x2 Trained Caracal x2 Vexing Devil x4 Rubblebelt Maaka x4 Gladecover Scout x4 Young Wolf x4 Ghor-Clan Rampager Land x4 Temple Garden x4 Stomping Ground x4 Sacred Foundry x4 Sunpetal Grove	Other Spells x4 Giant Growth x4 Titanic Growth x4 Phytoburst x4 Rancor x4 Moment of Heroism
Sideboard x4 Shock x4 Fog x2 Armed//Dangerous x2 Vexing Devil x3 Spire Tracer

This deck's purpose is for having simple one drop creatures that you pump with the pump spells as well as discarding the Bloodrush creatures. Sideboard includes burn spells, fog, more pump spells, and more creatures for discard. Vexing Devil is perfect for this given that you can play it turn one and deal four damage to an opponent (or leave it on the battlefield if they don't want to take the damage). This deck only includes 16 land, but most everything costs one mana. Well, except Titanic Growth, Phytoburst, and Moment of Heroism (and discarding Ghor-Clan Rampager). But nothing costs more than two mana, so not much land is needed.

Dimir (Blue/Black) Mill

Creatures x4 Jace's Phantasm x1 Jace's Mindseeker x3 Fog Bank Land x4 Drowned Catacomb x4 Watery Grave x2 Swamp x10 Island	Other Spells x4 Dream Twist x4 Thought Scour x4 Tome Scour x4 Mindsculpt x4 Paranoid Delusions x4 Pilfered Plans x2 Mind Grind Planeswalkers x2 Jace, Memory Adept Artifacts x3 Trepanation Blade x1 Sands of Delirium
Sideboard x1 Trepanation Blade x4 Inquisitor's Flail x1 Fog Bank x1 Jace, Memory Adept x2 Mind Grind x3 Dimir Keyrune x3 Laboratory Maniac

This should be somewhat self explanatory. Blue and black cards used to take out your opponent's library so that when they draw a card, they lose the game. Alternatively,, there are three Laboratory Maniac cards in the sideboard for you to switch them in, mill yourself and win the game by having Laboratory Maniac on the field. The sideboard is for extra creatures, using Inquisitor's Flail for double strike on Jace's Phantasm or mixing it with Trepanation Blade.

BUG/Ana (Blue/Black/Green) Unblockables

Creatures x4 Tormented Soul x4 Invisible Stalker x4 Latch Seeker x4 Phantom Warrior x4 Keymaster Rogue x4 Elusive Krasis Land x4 Drowned Catacomb x4 Watery Grave x1 Woodland Cemetery x2 Overgrown Tomb x1 Hinterland Harbor x2 Breeding Pool x3 Island x1 Forest	Other Spells x4 Giant Growth x4 Titanic Growth Artifacts x4 Trepanation Blade x4 Inquisitor's Flail x2 Elbrus the Binding Blade
Sideboard x4 Negate x4 Essence Scatter x3 Cancel x2 Dimir Keyrune x2 Aetherling

This deck is also self explanatory. All the creatures are unblockable, there are eight pump spells, and then artifacts to increase the damage dealt by the unblockable creatures. The sideboard is for counter spells and Dimir Keyrune and Aetherling to act as more unblockable creatures.