Schoeneman, the Visitor

Whenever Schoeneman, the Visitor leaves the battlefield, you may sacrifice another creature or discard a card. If you do, Discover 4.
If you discover an instant, discover 4 again. If sorcery, deal 3 damage to any target. If creature,
it enters the battlefield with three +1/+1 counters.
If artifact or enchantment, gain control of target
non-legendary creature.
..I remain.