As an additional cost to cast this spell, sacrifice a legendary creature.
Exile all creatures and graveyards. Put Ultimate Nullification on the bottom of its owner's library.

Whenever you attack while creatures you control have total power 8 or greater, target attacking creature gets +2/+0 and gains first strike until end of turn.

When this enchantment enters, you take the initiative.
Whenever you attack, if you or a player you're attacking has the initiative, you create two 1/1 white Soldier creature tokens that are tapped and attacking.

This creature enters with four healing counters on it.
Remove a healing counter from this creature: Prevent the next 1 damage that would be dealt to this creature this turn.
: Put a healing counter on this creature.

(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Exile all nonland permanents that aren't legendary.

Flying
When this creature enters, you gain 4 life.

Vigilance
When this creature enters, create a 2/2 white Knight creature token with vigilance.

Convoke
When this creature enters, put a +1/+1 counter on each creature that convoked it.

Create a 1/1 white Human creature token for each creature you control.
Flashback . This spell costs less to cast this way, where X is the greatest mana value of a commander you own on the battlefield or in the command zone.

Exile target creature, then proliferate.

As this creature enters, choose a color.
All Slivers have protection from the chosen color.

Creatures you control get +2/+1 until end of turn.
Foretell

Each creature deals damage to itself equal to its power.

Flying
When this creature enters, target creature gets +2/+2 and gains flying until end of turn.

: Prevent all damage that would be dealt to target tapped Merfolk or Kithkin creature this turn.

When Will Riker enters, put a +1/+1 counter on another target creature you control.

Flash
Flying
When this creature enters during the declare attackers step, for each attacking creature, you may reselect which player or permanent that creature is attacking. (It can't attack its controller or their permanents.)

Whenever Winter Soldier attacks, return target creature card with mana value less than or equal to Winter Soldier's power from your graveyard to the battlefield. If a Hero enters this way, it enters with an additional +1/+1 counter on it.

Flying
Other Griffin creatures get +1/+1.

Psionic Spells — When this creature enters, choose target instant or sorcery card in your graveyard, then roll a d20.
1-9 | You may put that card on top of your library.
10-20 | Return that card to your hand.

This spell costs less to cast if you control a Wizard.
When this creature enters, return target creature an opponent controls to its owner's hand.

Draw three cards, then look at the top card of each player's library.

Flying
: Target creature loses flying until end of turn. ( can be paid with one mana from a snow permanent.)

Flying
: Tap target creature with flying.

Domain — Target player draws a card for each basic land type among lands they control.

You get seven . Choose an inanimate object you own from outside the game. Put a power and toughness sticker on it. You may also put a name sticker, an art sticker, and/or an ability sticker on it. Put it onto the battlefield as a creature.

Create a 3/3 blue and red Elemental creature token with flying.

Instant and sorcery spells cost less to cast.

Flying, ward
Whenever you cast a Faerie or Wizard permanent spell, copy it. (The copy becomes a token.)