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I was wondering what other people's favorite combos/infinite combos were? Just to let you know mine is the infinite mana combo with Myr Galvanizer and Fireball . For the infinite opponent infinite damage win! Ohh and you need what is my favorite because you might need it to cast fireball Iron Myr .

Scythe of the Wretched
Triskelion
Spawning Pit (or any sac engine)

With Scythe of the Wretched attached, have Triskelion ping itself. Let that resolve, and then have it ping anything else until it has no more counters. Then sac Triskelion to Spawning Pit . The scythe's ability will trigger, bringing Triskelion back to the battlefield with 3 +1/+1 counters and Scythe of the Wretched attached. Repeat.

This is a difficult combo to interrupt since there's only two places it can be done:
1. Destroying either piece in response to the Scythe's equip ability.
2. Destroying the Scythe in response to the Scythe's triggered ability once Triskelion has been sacrificed.

If your opponent attempts to interrupt at any other time, you can have Triskelion damage itself and then sac it. You can then continue the combo, never giving your opponent's ability/spell the chance to resolve.

As an added bonus, if your opponent interrupts at the 2nd opportunity, you still get a fully-loaded Triskelion back, just without the scythe attached to it.

I will always love my first combo Basalt Monolith , Power Artifact , Rocket Launcher . I so enjoyed AQ as a set.

I like simple interactions. Cards that are good on their own, but when you put them together you get something really nice that just feels right.

Squadron Hawk into Faithless Looting or Brainstorm .
Carrion Feeder into something like Hellspark Elemental .
Ninja of the Deep returning somrthing that gets me value like Coiling Oracle .
Cloud of Faeries untapping an Izzet Boilerworks or similar land.
Armadillo Cloak on my Silhana Ledgewalker .
Flagstones of Trokair into Raze or Harrow .
Cavern Harpy with Chittering Rats .
Wild Mongrel or Vampire Hounds with Basking Rootwalla or Grave Scrabbler .
Anything like that basically. 

I like draw goats