Each land is a Forest in addition to its other land types.

When The Meathook Massacre enters, each creature gets -X/-X until end of turn.
Whenever a creature you control dies, each opponent loses 1 life.
Whenever a creature an opponent controls dies, you gain 1 life.

Flying
Other blue creatures you control get +1/+1.
Other black creatures you control get +1/+1.

Search your library for an enchantment card, reveal it, put it into your hand, then shuffle.

Protection from green
: Regenerate this creature.

Haste
When this creature enters, creatures you control gain trample and get +X/+X until end of turn, where X is the number of creatures you control.

As long as you control another Elf, you may play an additional land on each of your turns.
Landfall — Whenever a land you control enters, put two +1/+1 counters on target creature you control. It gains vigilance until end of turn.

Draw two cards, then discard two cards.

If an opponent would be dealt commander damage, they receive triple that amount of commander damage instead. (They don't actually take more damage, it just counts as triple the amount of commander damage.)

Flash
Flying, vigilance
When Archangel Avacyn enters, creatures you control gain indestructible until end of turn.
When a non-Angel creature you control dies, transform Archangel Avacyn at the beginning of the next upkeep.

This creature gets +1/+1 for each land card in your graveyard.
, Sacrifice a Forest or Plains: Search your library for a land card, put it onto the battlefield, then shuffle.

If you control a Swamp, you may pay 4 life rather than pay this spell's mana cost.
Destroy target nonblack creature. It can't be regenerated.

Target player activates a mana ability of each land they control. Then that player loses all unspent mana and you add the mana lost this way.

Whenever a player chooses one or more targets, each player reveals the top card of their library. The player who reveals the card with the greatest mana value may change the target or targets. If two or more cards are tied for greatest, the target or targets remain unchanged. Changing targets this way doesn't trigger abilities of permanents named Psychic Battle.

: Target creature you control with toughness less than this creature's power gains flying until end of turn. Destroy that creature at the beginning of the next end step.

Tap target untapped creature. That creature deals damage equal to its power to its controller.

Grapeshot deals 1 damage to any target.
Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)

All Rats have fear.
, Sacrifice a Rat: Create X 1/1 black Rat creature tokens, where X is the number of Rats you control.

Flying, first strike, trample
Once each turn, while you're searching your library, you may pay , reveal this card from your library and say "I'm coming, too" If you do, this card deals 2 damage to a player of your choice.

Defender
: This creature deals 1 damage to each opponent.
Whenever you cast an instant or sorcery spell, untap this creature.