First strike

(: Add .)

This spell costs less to cast, where X is the greatest power among creatures you control.
: Add . You gain 2 life.
Whenever a nontoken creature you control enters, put a +1/+1 counter on it and draw a card.

Starting with you, each player may pay any amount of life. Repeat this process until no one pays life. Each player creates a 1/1 black Rat creature token for each 1 life they paid this way.

Creatures with power 3 or greater don't untap during their controllers' untap steps.

Menace
At the beginning of your upkeep, you may create a Treasure token. When you do, target opponent creates a tapped Treasure token.
Whenever this creature attacks, it deals damage to defending player equal to the number of artifacts they control.

, Pay 1 life, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield, then shuffle.

Flying
Whenever this creature deals damage, you gain that much life.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

If you control a commander, you may cast this spell without paying its mana cost.
Counter target noncreature spell.

Pay 1 life, Sacrifice another creature: Create a Treasure token. (It's an artifact with ", Sacrifice this token: Add one mana of any color.")

Equipped creature gets +1/+1 and has trample and lifelink.
: Permanents your opponents control lose hexproof and indestructible until end of turn.
Equip

: Add .
Channel — , Discard this card: Destroy target artifact, enchantment, or nonbasic land an opponent controls. That player may search their library for a land card with a basic land type, put it onto the battlefield, then shuffle. This ability costs less to activate for each legendary creature you control.

, Sacrifice a creature: Destroy target nonblack creature.

Tap all lands target player controls and that player loses all unspent mana.

Landfall — Whenever a land you control enters, add one mana of any color.

As this land enters, choose a creature type.
: Add .
: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.

: Destroy target tapped creature.

Target spell or permanent becomes green. (Mana symbols on that permanent remain unchanged.)