Constricting Sliver is a pseudo-O-Ring that makes every sliver a Banisher Priest as well
In ECL, we have 10 different cards with this treatment
When Cavalier of Flame dies, it deals X damage to each opponent and each planeswalker they control, where X is the number of land cards in your graveyard
Since there's no main protagonist in that game, it instead utilizes various popular NPCs, along with a Hero token theme to represent the player character you create in the game
Also, its a six-mana 6/6, so it slots right into my Colossal Dreadmaw-themed deck
2 Sliver Swarm Features One Of Magics Most Popular Creatures Slivers Are A Unique Hivemind Of Creatures Slivers are a popular creature type in Commander due to their unique interaction with one another