Orcish Oriflamme

Attacking creatures you control get +1/+0.

Manabarbs

Whenever a player taps a land for mana, Manabarbs deals 1 damage to that player.

Goblin Polka Band

{2}, {T}, Pay {R} for each target: Tap any number of random target creatures. Goblins tapped in this way do not untap during their controllers' next untap phases.

Keldon Warlord

Keldon Warlord's power and toughness are each equal to the number of non-Wall creatures you control.

Goblin King

Other Goblins get +1/+1 and have mountainwalk.

Mountain

Helm of Chatzuk

{1}, {T}: Target creature gains banding until end of turn. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding a player controls are blocking or being blocked by a creature, that player divides that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

Tawnos's Weaponry

You may choose not to untap Tawnos's Weaponry during your untap step.
{2}, {T}: Target creature gets +1/+1 for as long as Tawnos's Weaponry remains tapped.

Giant Strength

Enchant creature
Enchanted creature gets +2/+2.

Goblin Balloon Brigade

{R}: Goblin Balloon Brigade gains flying until end of turn.

Mons's Goblin Raiders

Immolation

Enchant creature
Enchanted creature gets +2/-2.