Uzregart, Grave Trudger

Multikicker {b}{g} (You may pay an additional {b}{g} any number of times as you cast this spell.)
Whenever Uzregart attacks, you may exile up to
X cards from graveyards, where X is the number
of times it was kicked. Then, put twice that many
+1/+0 counters on Uzregart.
As long as Uzregart has five or more counters on
it, it has indestructible and deathtouch.