, Remove a counter from another permanent you control: Populate. Activate only as a sorcery. (Create a token that's a copy of a creature token you control.)
, Sacrifice another creature: Proliferate. Activate only as a sorcery. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
Xavier Sal turns counters into an engine: proliferate counters across your board, then convert removed counters into populate triggers to flood the field with copies of your best creature tokens. You build a wide army of token copies while sacrificing fodder to grow everything, eventually overwhelming the table with combat damage or value loops.
Two flexible engines (populate and proliferate) on a cheap 3-mana commander
Deep synergy with +1/+1 counters, charge counters, and any token-making strategy
Sultai colors give access to the best ramp, card draw, and recursion
Sacrifice outlet built into the command zone fuels aristocrats payoffs
Both abilities are sorcery-speed and tap Xavier, so it's slow and only one activation per turn each
Heavily reliant on having counters and creature tokens already in play — weak without setup
Vulnerable to commander removal and board wipes that reset your token engine
No built-in evasion or protection; needs the rest of the deck to close games
Legendary Creature — Human Fungus Pirate
, Remove a counter from another permanent you control: Populate. Activate only as a sorcery. (Create a token that's a copy of a creature token you control.)