Kro, Beyond Comprehension

When Kro, Beyond Comprehension enters the battlefield, all creatures your opponents control with toughness 3 or greater gain "At the beginning of your upkeep, sacrifice this creature unless you discard a card or pay 1 life"
Indestructible
When Kro, Beyond Comprehension Deals combat damage to a creature, that creature gains "at the beginning of your upkeep, Sacrifice this creature unless you pay 3 life"