Bloodline counter

Bloodline counters are a type of counter that tracks upkeep for the Transform mechanic of Double-faced cards.
==Description==
<c>Edgar Markov's Coffin</c> from Innistrad: Crimson Vow is the first artifact to produce bloodline counters. The counters are placed on the artifact that produces them after each upkeep and cause the Double-faced card to Transform when it reaches a certain number of counters.