Slave Knight Gael

Double Strike, Reach, Trample
Slave Knight Gael enters the battlefield with X
+1/+1 counters on it where X is the total number
of legendary spells in each players' graveyard
Whenever a Legendary Creature enters the battlefield under another player's control. Slave
Knight Gael Fights it. If it would be Destroyed
Exile it instead and put a +1/+1 Counter on Slave Knight Gael