Rankle, Pitiless Trickster

Legendary Creature — Faerie Rogue - (mythic)

Flying
Rankle has lifelink and haste as long as an opponent controls no creatures.
When Rankle enters the battlefield, you may pay 1 life. When you do, each player discards a card and sacrifices a creature.
Whenever a player discards a card, Rankle perpetually gets +1/+0.