The Phoenix Oracle

The Phoenix Oracle enters the battlefield with a blood counter.
At the beginning of your end step, if you've sacrificed a number of creatures equal to the number of blood counters on The Phoenix Oracle this turn, put a blood counter on it.
At the beginning of your upkeep, if The Phoenix Oracle has 4 blood counters on it, each player discards their hand and sacrifices all permanents they control. Put up to one creature, land, artifact, enchantment, and planeswalker from each player's graveyard onto the b