Golgari loves -1/-1 counters and there are just about infinite ways to produce them alongside greens synergy with counter distribution
You draw X cards and the chosen creatures get +X/+X and gain trample until end of turn, where X is the difference between the chosen creatures powers
Another card that pairs well with Sephiroth is Goblin Bombardment
At the beginning of combat on your turn, create a 1/1 black Rat creature token with "This token can't block." Legendary Creature - Rat Noble Color tag templates(None) Loyal Apprentice Haste Lieutenant At the beginning of combat on your turn, if you control your commander, create a 1/1 colorless Thopter artifact creature token with flying
Elite Deck Gift Missions and Handy Card Collection Missions will be added, running from late April to early July, letting players pick up some previously released, powerful Fire-type cards in Mega Charizard Y EX and Moltres EX, along with Trainer cards that include May and Cyrus
Also, keep an eye out for potential combos and dont exert characters you cant afford to lose for them