Fun with milling, but not quite infinite

, , Sacrifice this creature: Return target creature card from your graveyard to the battlefield. That creature gains haste. At the beginning of the next end step, sacrifice it.

Whenever a creature dies, put a charge counter on this enchantment. At the beginning of your first main phase, add for each charge counter on this enchantment.

Flying Whenever another creature leaves the battlefield, you may have target player mill two cards. Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)