Pako, Planar Spellhound

Partner with Haldan, Grand Arcanist

Haste, trample

Whenever Pako attacks, exile the top card of each player's
library and put a fetch counter on each of them. Put a
+1/+1 counter on Pako for each nonland card exiled this
way.

Whenever you cast a spell from exile, pako deals damage
equal to that spell's mana value to any target.