At the beginning of combat on your turn, if you control each creature on the battlefield with the greatest power, gain control of target creature an opponent controls until end of turn. Untap that creature. It gains haste until end of turn. (It can attack and TAP this turn.)

2R: Miners Bane gets +1/+0 and gains trample until end of turn. (If it would assign enough damage to its blockers to destroy them, you may have it assign the rest of its damage to defending player or planeswalker.)

Other red creatures you control get +1/+1.

R, TAP: Another target red creature you control gains haste until end of turn. (It can attack and TAP this turn.)

TAP, Discard a card: Draw a card.

As long as you control an artifact, Scrapyard Mongrel gets +2/+0 and has trample. (If it would assign enough damage to its blockers to destroy them, you may have it assign the rest of its damage to defending player or planeswalker.)

Seismic Strike deals damage to target creature equal to the number of Mountains you control.

Flying

R: Shivan Dragon gets +1/+0 until end of turn.

As an additional cost to cast Shrapnel Blast, sacrifice an artifact.

Shrapnel Blast deals 5 damage to target creature or player.

Flying

When Siege Dragon enters the battlefield, destroy all Walls your opponents control.

Whenever Siege Dragon attacks, if defending player controls no Walls, it deals 2 damage to each creature without flying that player controls.

First strike

3RR: Soul of Shandalar deals 3 damage to target player and 3 damage to up to one target creature that player controls.

3RR, Exile Soul of Shandalar from your graveyard: Soul of Shandalar deals 3 damage to target player and 3 damage to up to one target creature that player controls.