Kruxhura, Ravenous Dictator

At the beginning of each player's end step, that
player loses 1 life for each untapped land they
control, then loses 2 life if they cast no spells
this turn.
Whenever mana empties from an opponent's
mana pool at the end of a phase or turn, put a
+1/+1 counter on Kruxhura.
Deathtouch, Menace