Whenever another Goblin you control becomes blocked, sacrifice it. If you do, it deals 4 damage to each creature blocking it.
Sacrifice two Mountains: Create two 1/1 red Goblin creature tokens.

, , Discard your hand: Draw a card for each creature you control.

Haste
Sacrifice a Goblin: Clickslither gets +2/+2 and gains trample until end of turn.

Forests you control are 1/1 green Elf creatures that are still lands.
, Sacrifice an Elf: Target creature gets +3/+3 until end of turn.

Tap five untapped Elves you control: Create a 7/7 green Elemental creature token with trample. (It can deal excess combat damage to the player or planeswalker it's attacking.)

Protection from red
Tap five untapped Goblins you control: Skirk Fire Marshal deals 10 damage to each creature and each player.

When Siege-Gang Commander enters, create three 1/1 red Goblin creature tokens.
, Sacrifice a Goblin: Siege-Gang Commander deals 2 damage to any target.

You may exile two green cards from your hand rather than pay this spell's mana cost.
Allosaurus Rider's power and toughness are each equal to 1 plus the number of lands you control.