At the beginning of your upkeep, create a colorless artifact token named Land Mine with "R, Sacrifice this artifact: This artifact deals 2 damage to target attacking creature without flying." Then flip a coin. If you lose the flip, Goblin Kaboomist deals 2 damage to itself.
Other Rigger creatures you control get +1/+0 and have haste. If a Rigger you control would assemble a Contraption, it assembles two Contraptions instead.
Haste When Tuktuk the Explorer is put into a graveyard from the battlefield, put a legendary 5/5 colorless Goblin Golem artifact creature token named Tuktuk the Returned onto the battlefield.
1R, Sacrifice a land: Put a +1/+1 counter on Goblin Razerunners. At the beginning of your end step, you may have Goblin Razerunners deal damage equal to the number of +1/+1 counters on it to target player.
Whenever Frenzied Goblin attacks, you may pay R. If you do, target creature can’t block this turn.
Whenever a creature attacks you or a planeswalker you control, it gets +2/+0 until end of turn. 2: Target player other than Crown of Doom's owner gains control of it. Activate this ability only during your turn.
If an opponent controls more lands than you, search your library for up to three Plains cards, reveal them, and put them into your hand. Then shuffle your library.
When Krenko, Tin Street Kingpin attacks, put a +1/+1 counter on it, then create a number of 1/1 red Goblin creature tokens equal to Krenko's power.
Trample When Boldwyr Heavyweights comes into play, each opponent may search his or her library for a creature card and put it into play. Then each player who searched his or her library this way shuffles it.
You may reveal this card from your opening hand. If you do, at the beginning of the first upkeep, put a 1/1 red Goblin creature token with haste onto the battlefield. When Chancellor of the Forge enters the battlefield, put X 1/1 red Goblin creature tokens with haste onto the battlefield, where X is the number of creatures you control.
T: Add one mana of any color. Put a nest counter on Twitching Doll. T, Sacrifice Twitching Doll: Create a 2/2 green Spider creature token with reach for each counter on Twitching Doll. Activate only as a sorcery.