Myr Superion

Spend only mana produced by creatures to cast this spell.

Alloy Myr

Palladium Myr

Swamp

Winter Orb

As long as Winter Orb is untapped, players can't untap more than one land during their untap steps.

Counterspell

Island

Bone Dancer

Whenever Bone Dancer attacks and isn't blocked, you may put the top creature card of defending player's graveyard onto the battlefield under your control. If you do, Bone Dancer assigns no combat damage this turn.