Goblin Warchief

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

Ogre Battledriver

Whenever another creature you control enters, that creature gets +2/+0 and gains haste until end of turn. (It can attack and {T} this turn.)

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.

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