Mechanics include Wurmfood, Gold, Bounty, and Dig. I originally had permanently-reveal duel, but removed it when high-cost monsters were pushed out for wurmfood.
Unassuming Buffalo 3G
Creature - Ox (C)
Wurmfood 8 (8, sacrifice this: put an 8/8 colorless wurm creature token onto the battlefield.)
2/4
Dwarven Milita 4WW
Creature - Dwarf Warrior (C)
Flash
Dig 2 (2, Discard this card: Reveal cards from the top of your library until you reveal a land card. Put that card into your hand and the rest on the bottom of your library in a random order.)
3/6
Bank Robber 3R
Creature - Viashino Rogue (C)
Haste
Whenever ~ deals combat damage to a player, gain a gold counter. (Gold counters may be spent as colorless mana.)
2/3
Dust Storm 4RR
Sorcery (C)
Creatures target player controls can't block this turn.
Dig 2 (2, Discard this card: Reveal cards from the top of your library until you reveal a land card. Put that card into your hand and the rest on the bottom of your library in a random order.)
Shake Down 2U
Instant (C)
Return target creature to its owner's hand. You gain gold counters equal to its toughness. (Gold counters may be spent as colorless mana.)
Saguaro Striker 1GG
Creature - Treefolk Warrior (C)
Whenever ~ deals damage to a creature, ~ deals that much damage to that creature's controller.
3/2
Magpie Spellslinger 3U
Creature - Bird Wizard (C)
Flying
Whenever ~ attacks, you may have target creature get -2/-0 until end of turn.
1/2
Coin Snatcher 2B
Creature - Devil Rogue (C)
Deathtouch
Whenever a creature dealt damage by ~ this turn dies, gain a gold counter. (Gold counters may be spent as colorless mana.)
1/3
Sheriff's Deputy 1W
Creature - Human Scout (C)
Bounty - When ~ enters the battlefield, you may place a bounty token on target creature. Whenever a creature an opponent controls with a bounty counter on it dies, you may gain 2 life.
2/2
Hitman 2B
Creature - Human Warrior (C)
When ~ enters the battlefield, target creature gets -1/-1 until end of turn
2/1
Hired Outlaw 2B
Creature - Devil Rogue (U)
Bounty - When ~ enters the battlefield, you may place a bounty token on target creature. Whenever a creature an opponent controls with a bounty counter on it dies, you may have target player discard a card.
Pay 1 gold: Put a bounty counter on target creature.
1/1
Inattentive Goatherd 3RR
Creature - Human (U)
When ~ enters the battlefield, put three 0/1 white goat creature tokens onto the battlefield
Non-wurm creatures you control have Wurmfood 8 (8, sacrifice this creature: Put an 8/8 colorless wurm creature token onto the battlefield.)
2/2
Coyote Pack XGG
Creature - Wolf (U)
Trample
~ enters the battlefield with X +1/+1 counters on it.
0/0
(Rare slot still open)