+Chieftain (8)
Haste
Threshold — As long as seven or more cards are in your graveyard, Centaur Chieftain has "When Centaur Chieftain enters, creatures you control get +1/+1 and gain trample until end of turn."
Whenever Chieftain en-Dal attacks, attacking creatures gain first strike until end of turn.
Haste (This creature can attack and as soon as it comes under your control.)
Other Goblin creatures you control get +1/+1 and have haste.
: Regenerate Gorilla Chieftain.
This spell costs less to cast for each creature card in your graveyard.
Once during each of your turns, you may cast a creature spell from your graveyard.
Kird Chieftain gets +1/+1 as long as you control a Forest.
: Target creature gets +2/+2 and gains trample until end of turn. (It can deal excess combat damage to the player or planeswalker it's attacking.)
At the beginning of combat on your turn, you may pay . When you do, distribute X +1/+1 counters among any number of target Elves.
Partner (You can have two commanders if both have partner.)
Trample, indestructible
Whenever another creature you control attacks, it gains trample and indestructible until end of turn.
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. When you do, distribute X +1/+1 counters among any number of target Elves.