serpent cards mtg Bladecoil [The Brothers' War] Sacrifice an Island Sea Serpent - Fifth Edition:

Magic 30th Anniversary card list & price guide

And it allows the players to do something they love: makes creatures fight

Creature Sheep Mount Vigilance Whenever this creature attacks while saddled, create a 1/1 white Sheep creature token

The common in Kefka's set has a 4/4 size and Swampcycling for mana getting and then arrives and you'll have them discard and then lose two life to trigger our leader post flip and then exiles three cards from their library too

While this might not seem like the best ability at first glance since you have to sacrifice your own creature, cards like Archon of Cruelty, and The Immortal Sun are all well-worth the cost of a creature to place on the battlefield early