For the black Avatar, it was if there were 10 creatures in all graveyards
Destroy-based removal stops mattering , and sweepers lose their ability to reset the game
If you're doing well, your opponents will all probably have less life than you, in which case you get a bunch of tokens every turn
#5 - Snapcaster Mage Wizards find themselves on the Magic Invitational Cards often, Snapcaster Mage being the most recent of them
The deck is super reliant on Jeleva sticking in order to do much, but she's cheap enough that you can recast her a few times and also you will get to the point where you can just hardcasting your haymakers and win that way as well
Then, when at least one creature with counters on it deals damage to a player, you draw a card and proliferate, meaning that all your creatures with at least one token receive an additional token