At the beginning of the end step, if you control no creatures, sacrifice this land.
: Add one mana of any color.

Whenever this land becomes tapped, it deals 1 damage to you.
: Add one mana of any color.

Target creature gets +3/+3 until end of turn.

, , Sacrifice this creature: Destroy target enchantment.

Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)

Protection from red
Shadow (This creature can block or be blocked by only creatures with shadow.)

Haste
Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.

Volcanic Hammer deals 3 damage to any target.

Protection from black
At the beginning of each end step, if this creature dealt damage to an opponent this turn, put a +1/+1 counter on it.

White creatures get +1/+1.

Sacrifice this creature: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

: Destroy target tapped creature.

Other Elf creatures get +1/+1 and have forestwalk. (They can't be blocked as long as defending player controls a Forest.)

Creatures you control get +1/+1.

Other Goblin creatures you control get +1/+1.
: Regenerate another target Goblin.

Flying (This creature can't be blocked except by creatures with flying or reach.)
Sacrifice this creature: It deals 2 damage to each creature without flying.
: Return this card from your graveyard to your hand. Activate only during your upkeep.

Flying
Menace (This creature can't be blocked except by two or more creatures.)
This creature can block an additional creature each combat.
: This creature gets +2/+0 until end of turn.

Serra Avatar's power and toughness are each equal to your life total.
When Serra Avatar is put into a graveyard from anywhere, shuffle it into its owner's library.