Instant and sorcery spells you cast cost less to cast.
Whenever you cast an instant or sorcery spell, put a charge counter on this artifact. Then if there are four or more charge counters on it, you may remove those counters and transform it.

Reyhan enters with three +1/+1 counters on it.
Whenever a creature you control dies or is put into the command zone, if it had one or more +1/+1 counters on it, you may put that many +1/+1 counters on target creature.
Partner (You can have two commanders if both have partner.)

: Add .
, Sacrifice this land: Add .

Flying
: Add one mana of any color.

Whenever this creature deals combat damage to a player or planeswalker, draw a card.
Discard a card: Put a +1/+1 counter on this creature.
Exile three cards from your graveyard: This creature gains flying until end of turn.

When Clive enters, you may discard your hand, then draw cards equal to your devotion to red. (Each in the mana costs of permanents you control counts toward your devotion to red.)
, : Exile Clive, then return it to the battlefield transformed under its owner's control. Activate only as a sorcery.

Whenever you discard a card, choose one that hasn't been chosen this turn —
• Draw a card.
• Create a Treasure token.
• Each opponent loses 3 life.

Enchant player
At the beginning of enchanted player's first upkeep each turn, that player gets an additional upkeep step after this step.

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Double strike
Whenever this creature mutates, it deals 4 damage to target creature or planeswalker an opponent controls and you gain 4 life.

Flying, trample
Pay 2 life, Sacrifice another creature: Search your library for a card, put that card into your hand, then shuffle.

Flying, haste
When Karrthus enters, gain control of all Dragons, then untap all Dragons.
Other Dragon creatures you control have haste.

Haste
Whenever you discard a card, this creature deals 1 damage to each opponent.
, Discard a card: Draw a card. Activate only if this creature is attacking.

Equipped creature gets +0/+3.
Astral Projection — : Equipped creature phases out. (Treat it and anything attached to it as though they don't exist until its controller's next turn.)
Equip

This land enters tapped unless you control two or more other lands.
: Add or .

Creatures and lands you control have shroud. (They can't be the targets of spells or abilities.)
When a creature you control attacks, sacrifice this enchantment.

This land enters tapped unless you have two or more opponents.
: Add or .

Permanents you control gain hexproof and indestructible until end of turn.

Permanents you control gain hexproof and indestructible until end of turn.

Protection from planeswalkers and from Wizards
Greensleeves's power and toughness are each equal to the number of lands you control.
Landfall — Whenever a land you control enters, create a 3/3 green Badger creature token.

Other Horses you control have indestructible.
At the beginning of each end step, if you gained life this turn, create a 5/5 white Horse creature token.