Dwarven Stone-chucker

Dwarven Stone-chucker doesn't untap during your untap step.
{2}{r},{t}: Dwarven Stone-chucker deals 4 damage to target creature, or destroy target Artifact.
Tap a creature you control: untap Dwarven
Stone-chucker. If the tapped creature is a Dwarf, the next activated ability originating from a red permanent you use this turn costs up to
{2}{r} less.