Karim, The Gentle Merfolk

Whenever an opponent draws their second card
on a turn, you create a 0/1 Seal Creature Token
with Charm.
If a player has 10 or more Charm Counters,
they gain a Legendary 0/1 Seal Token with
Friendship and become Charmed.
Creatures Charmed players control can't
attack you or planeswalkers you control.