Shadow (This creature can block or be blocked by only creatures with shadow.)
Forecast — , Reveal this creature from your hand: Target creature gains shadow until end of turn. (Activate only during your upkeep and only once each turn.)

Changeling (This card is every creature type.)
Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature.

Flying

Enchant creature
Enchanted creature gets +1/+1 and has "Whenever this creature deals damage to an opponent, you may draw a card."
Umbra armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)

You gain 6 life.
Cycling (, Discard this card: Draw a card.)
When you cycle this card, you may gain 2 life.

You gain 2 life for each creature card in your graveyard.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

, : Put target Aura card from a graveyard onto the battlefield under your control attached to a creature you control.

Choose any target. Reveal cards from the top of your library until you reveal a nonland card. Erratic Explosion deals damage equal to that card's mana value to that permanent or player. Put the revealed cards on the bottom of your library in any order.

( can be paid with either or 2 life.)
Target creature gets -5/-5 until end of turn.

When this creature enters, target opponent puts a card from their hand on top of their library.

, Sacrifice a creature: Create two Treasure tokens. (They're artifacts with ", Sacrifice this token: Add one mana of any color.")
Sacrifice three Treasures: Draw a card.

Until end of turn, target artifact or creature becomes a 4/4 Angel artifact creature and gains flying.
Draw a card.

Tap an untapped Dwarf you control: Target creature gets +2/+0 until end of turn.

Destroy target permanent. Its controller creates a 3/3 green Elephant creature token.

When this creature enters, create a 1/1 colorless Thopter artifact creature token with flying.
Artifact creatures you control have haste. (They can attack and as soon as they come under your control.)

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When this creature is turned face up, target creature gets +2/-2 or -2/+2 until end of turn.

When this creature enters, if you control two or more Islands, you may tap two target permanents.
When this creature enters, if you control two or more Mountains, you may have this creature deal 2 damage to target player or planeswalker.

Flying
At the beginning of your upkeep, each opponent loses 1 life and you gain 1 life.

Sacrifice this creature: Put a +1/+1 counter on target creature.
Dredge 3 (If you would draw a card, you may mill three cards instead. If you do, return this card from your graveyard to your hand.)

Whenever a player casts a spell, this enchantment deals 2 damage to that player.

Whenever a player taps a land for mana, if it's not that player's turn, destroy that land.

Fabricate 2 (When this creature enters, put two +1/+1 counters on it or create two 1/1 colorless Servo artifact creature tokens.)

: Add one mana of any color.
Tap an untapped legendary creature you control: Add one mana of any color.

Whenever you cast an enchantment spell, draw a card.

Search your library for a card, then shuffle and put that card on top. You lose 2 life.

Lifelink
When this creature dies, put it on the bottom of its owner's library.

Flying
Whenever you cast an enchantment spell, put a +1/+1 counter on this creature.

, : Create a token that's a copy of target creature card in your graveyard, except it's an artifact in addition to its other types. It gains haste. Sacrifice it at the beginning of the next end step.

First strike
Other Vampire creatures you control get +1/+1 and have first strike.

Attacking creatures you control have deathtouch.
, : Choose one —
• Put a +1/+1 counter on target creature.
• Bow of Nylea deals 2 damage to target creature with flying.
• You gain 3 life.
• Put up to four target cards from your graveyard on the bottom of your library in any order.

Whenever this creature attacks, tap target creature an opponent controls.

Activated abilities of creatures cost less to activate. This effect can't reduce the mana in that cost to less than one mana.

: Switch target creature's power and toughness until end of turn.

Each player loses X life, discards X cards, sacrifices X creatures of their choice, then sacrifices X lands of their choice.

Create three 1/1 red Goblin creature tokens.

Constellation — Whenever an enchantment you control enters, put a +1/+1 counter on target creature. That creature gains flying until end of turn.