Tiamat

Trample, hexproof
When Tiamat enters the battlefield and on each opponent's end step, choose one —
•Tiamat, Dragon Goddess deals 2 damage to up
to three target creatures.
•Place two -1/-1 counters on target creature.
During your upkeep, place another -1/-1 counter
on that creature.
•Tap target creature. It doesn't untap during its controller's untap phase.