Viscera Seer

A free sacrifice outlet with no mana cost, no tap symbol, and no cap on how many times it fires in a turn: that frictionless profile is why the card shows up wherever a deck wants to convert creatures into something on demand. The scry rider rarely drives the decision. What the engine builders care about is that each activation costs nothing but the creature you were already sacrificing, which makes Viscera Seer the throttle valve in combos that loop a creature's death and return forever. Pair it with anything that comes back (a persist body with a way to clear the counter, a recursion loop with a mana source) and the loop becomes infinite scry, which digs to whatever payoff ends the game. Outlets like this are graded on what they ask back, and the Seer asks nothing: a one-mana body that demands no resource to keep going. The scry is the considered touch on an otherwise purely utilitarian design, smoothing your draws while you grind through a sacrifice plan instead of just dumping creatures into a void. This is the outlet for the player who wants the cheapest possible repeatable trigger, and it has stayed a reference point for what that slot ought to cost.