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When Contagion Engine enters the battlefield, it automatically adds a -1/-1 counter to each creature a target player controls

Shadowless Holos typically had -15 on the front and +15on the back

You just need to lock the game down until your opponent is out of cards in their hand, and then slowly chip away at them

Mix in some zombies cards like Champion of the Perished and Tainted Adversary and youll be swinging in for huge damage with a Zombie / Skeleton army in no time

High rolls off of Neverwinter Hydra, Delina, Wild Mage, and Centaur of Attention are optimal, but Wyll will be gaining +1/+1 counters regardless of outcome