Bubbler

Colorful ink (When you cast this spell, choose a
color. This spell becomes that color.)
When Bubbler enters the battlefield, put an
indestructible counter on target creature.
When Bubbler is destroyed, remove this counter.
Tap a creature you control with an indestructible
counter: Put an indestructible counter on target
creature and tap it. When Bubbler is destroyed,
remove all counters made this way.