Victory by poison counters was explored years ago, but it was never perfected until New Phyrexia
Thunderwolf Cavalry gives each creature you control a +1/+1 counter when it does combat damage to a player
This makes using the Magic: The Gathering dredge difficult for some players
Black Knight Creature Human Knight First strike (This creature deals combat damage before creatures without first strike.) Protection from white (This creature can't be blocked, targeted, dealt damage, or enchanted by anything white.)2/2 Your trust means everything to us
Artifact Color tag templates(None) Veil of Assimilation Whenever this artifact or another artifact you control enters, target creature you control gets +1/+1 and gains vigilance until end of turn
Assuming you can afford to pay eight mana and unlock both Rooms right off the hop, every enchantment cast produces +1/+1 counters equal to its mana cost, and every permanent you cast immediately becomes an enchantment