For example, this vampire soldier loves sagas, which grow it and go to the graveyard for later value
(To populate, create a token thats a copy of a creature token you control.) No harm can come to me while the Worldsoul shelters me. Watermark: Selesnya Illustrated by Mark Zug Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
It seems very unlikely that the consistency you lose from playing 20 extra cards will decrease your odds of winning by 10% or more, which would mean even discounting any specific Yorion, Sky Nomad synergy, it would be correct for a lot of decks to add some extra cards to meet the Bird Serpent's companion restriction
For example, Mox Jet adds one black mana to the mana pool when tapped, allowing for such an extreme mana acceleration that it gives players an unfair advantage in play
I even put my old Gishath, Suns Avatar EDH deck back together with the intent to upgrade it with cards from Lost Caverns
For example, if Ral, Leyline Prodigy enters the battlefield during combat, there will be an opportunity for your opponent to remove him before you can activate one of his abilities
