Sage is a staple in the counters decks, but at least its too good/too expensive to likely be included in the deck
Fynn is a 1/3 Human Warrior with Deathtouch, and whenever a Creature you control with Deathtouch deals combat damage to a player, that player gets two Poison Counters
folded prior to printing (resulting in a blank spot on one side of the card), folded after printing but before cutting, and folded after one side has been printed (resulting in the flag being double printed)
Zegana also pairs really well with high-powered green cards like Ghalta, Primal Hunger, which can enter the field before Zegana and give you 12 cards in hand and 12 +1/+1 counters
The former lets you use an enchantment with the background subtype as your second commander while the latter lets you use a creature with the partner ability as your second commander
If Yisan is your commander, youll want to pay close attention to which creatures go into your deck