Ashnod's Transmogrant

Oracle Text

T, Sacrifice Ashnod's Transmogrant: Put a +1/+1 counter on target nonartifact creature. That creature becomes an artifact in addition to its other types.

Card Rulings

9/16/2007 It’s the ability, not the counter that makes the creature an artifact. The creature remains an artifact even if the +1/+1 counter is removed.