He stops your foes from gaining life, nasty good
Given that it's not difficult to have more than two to three Swamps, especially when casting a five-mana creature, and that Urborg, Tomb of YawgmothUrborg, Tomb of Yawgmoth lets you do so while not having to actually stop yourself from playing utility lands, this has a rather rapid effect on the amount of mana available to you
Creature - Wolf Color tag templates(None) Young Wolf Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.) Creature - Wolf Color tag templates(None) Creature (CTRL to add secondary) Enchantment Qty: 10 Price: $16.48 Beastmaster Ascension Whenever a creature you control attacks, you may put a quest counter on this enchantment
Hunt for Specimens 6 This is basically Eyetwitch but with the learn upfront
Arcade Gannon Arcade Gannon has a powerful recursive ability, but I fear it lacks the speed demanded by modern Commander
Maddening Cacophony Another card that seems designed to allow mill to keep up in the 4-player, 100-card world of Commander, Maddening Cacophony can get the majority of your opponents cards into the graveyard all by itself