Goblin Morale Sergeant

Haste
Enlist
Whenever Goblin Morale Sergeant enlists a nontoken creature, you may conjure a duplicate of that creature into the top five cards of your library at random. The duplicate perpetually gets +1/+0 and gains haste.

Play with Fire

Play with Fire deals 2 damage to any target. If a player is dealt damage this way, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Goblin Oriflamme

Attacking creatures you control get +1/+0.

Battle Cry Goblin

{1}{R}: Goblins you control get +1/+0 and gain haste until end of turn.
Pack tactics — Whenever this creature attacks, if you attacked with creatures with total power 6 or greater this combat, create a 1/1 red Goblin creature token that's tapped and attacking.

Krenko, Mob Boss

{T}: Create X 1/1 red Goblin creature tokens, where X is the number of Goblins you control.

Legion Warboss

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
At the beginning of combat on your turn, create a 1/1 red Goblin creature token. That token gains haste until end of turn and attacks this combat if able.

Goblin Warchief

Goblin spells you cast cost {1} less to cast.
Goblins you control have haste.

Mountain

Rundvelt Hordemaster

Other Goblins you control get +1/+1.
Whenever this creature or another Goblin you control dies, exile the top card of your library. If it's a Goblin creature card, you may cast that card until the end of your next turn.

Goblin Trashmaster

Other Goblins you control get +1/+1.
Sacrifice a Goblin: Destroy target artifact.

Abrade

Choose one —
• Abrade deals 3 damage to target creature.
• Destroy target artifact.

Reckless Ringleader

Haste
When Reckless Ringleader enters the battlefield, choose a creature card in your hand. It perpetually gains haste.

Goblin Gang Leader

When this creature enters, create two 1/1 red Goblin creature tokens.

Goblin Chieftain

Haste (This creature can attack and {T} as soon as it comes under your control.)
Other Goblin creatures you control get +1/+1 and have haste.

Goblin Influx Array

Goblin spells you cast cost {R} less to cast. (If it doesn't require {R}, it costs {1} less to cast.)
At the beginning of your end step, conjure a random card from Goblin Influx Array's spellbook into your hand.

Battle Squadron

Flying
Battle Squadron's power and toughness are each equal to the number of creatures you control.