Oh, and it won't cost you an arm and a leg like Wrenn and Six
You won't find a binder large enough to house all 1,025 critters in this range, but it is the most secure I've used so far (sorry, Ultra Pro)
It lets you untap your Priest of Titania to turn your army of elves into a swath of mana, whether you build to a big Fireball or just drop every elf in your hand all at once
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First off, it's immune to special conditions, which shuts off one avenue an opponent might use to counter it
Forcing your opponents to play around Archangel Avacyn whenever you have the mana available to cast her is a huge win