Ekko, Genius in his Time

Haste, first strike.
When Ekko, Genius of His Time attacks, put a Time Paradox counter on him.
When Ekko, Genius of His Time deals fatal damage, prevent it if it has 4+X Time Paradox counters on it. If you do, instead of dying, he fully recovers stamina, put X +1/+1 counters on him.
When his stamina reaches 10 or more, he gains hexproof.