That's pretty easy to grasp
Once per turn, when creatures with counters on them deal combat damage to a player, the player who controls Tidus can draw a card and proliferate (i.e., add an extra counter to creatures and permanents that already have them)
So, heres what you need to know about Commander, and how you can get into it
Upgrade 3 Nesting Dovehawk is too much of a perfect fit for this deck
In Standard, Destroy Evil sees lots of play given the dominance of four-toughness Creatures and Enchantments like Wedding Announcement
The decks other character, Cruella De Vil, Miserable as Usual, is a much cheaper card able to be played earlier on, and can force characters off the field when shes banished by returning a character to its players hand - playing into the decks more control-like tendencies