Lavitan, Demon of Envy

Indestructible, islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Each opponent who controls more creatures than
you can't cast creature spells. The same is true
for artifacts, enchantments and lands.
Lose 2 life: Each opponent sacrifice a creature, an artifact, an enchantment or a land. Activate this
ability only if an opponent controls more
creatures, artifacts, enchantments or lands than
you.
"My envy can be a bad thing, but only for you."