Colossus Hammer

Equipped creature gets +10/+10 and loses flying.
Equip {8} ({8}: Attach to target creature you control. Equip only as a sorcery.)

Gratuitous Violence

If a creature you control would deal damage to a permanent or player, it deals double that damage instead.

Blood Mist

At the beginning of combat on your turn, target creature you control gains double strike until end of turn.

Silent Arbiter

No more than one creature can attack each combat.
No more than one creature can block each combat.

Blackblade Reforged

Equipped creature gets +1/+1 for each land you control.
Equip legendary creature {3}
Equip {7}

Kediss, Emberclaw Familiar

Whenever a commander you control deals combat damage to an opponent, it deals that much damage to each other opponent.
Partner (You can have two commanders if both have partner.)

Rograkh, Son of Rohgahh

First strike, menace, trample
Partner (You can have two commanders if both have partner.)