Boulder Jockey

At the beginning of combat on your turn, you may pay and sacrifice an artifact. If you do, create a 3/1 red Construct artifact creature token with haste.

Trample

You may exert this creature as it attacks. When you do, create a tapped and attacking token that's a copy of target creature you control. Sacrifice the token at the beginning of the next end step. (An exerted creature won't untap during your next untap step.)

Whenever you attack, you may sacrifice another creature or an artifact. If you do, create a 4/1 black Skeleton creature token with menace that's tapped and attacking. (It can't be blocked except by two or more creatures.)

Choose a Background (You can have a Background as a second commander.)

First strike

Whenever this creature attacks, for each creature token you control that entered this turn, create a tapped and attacking token that's a copy of that token. At the beginning of the next end step, sacrifice those tokens.

Creatures you control get +1/+0.

Whenever you attack, create a 1/1 red Warrior creature token that's tapped and attacking. Sacrifice it at the beginning of the next end step.

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)

Whenever this creature attacks, you may pay . If you do, create X 1/1 red Elemental creature tokens that are tapped and attacking. At the beginning of the next end step, exile those tokens unless you have the city's blessing.