As Ineffable Blessing enters the battlefield, choose Flavorful or Bland.
• Flavorful — Whenever a creature with flavor text enters the battlefield under your control, draw a card.
• Bland — Whenever a creature without flavor text enters the battlefield under your control, draw a card.

As Ineffable Blessing enters the battlefield, choose an artist.
Whenever a creature with art by the chosen artist enters the battlefield under your control, draw a card.

As Ineffable Blessing enters the battlefield, choose white-bordered or silver-bordered.
Whenever a creature with the chosen border enters the battlefield under your control, draw a card.

As Ineffable Blessing enters the battlefield, choose a rarity.
Whenever a creature with the chosen rarity enters the battlefield under your control, draw a card.

As Ineffable Blessing enters the battlefield, choose odd or even.
Whenever a creature with a collector number of the chosen value enters the battlefield under your control, draw a card.

As Ineffable Blessing enters the battlefield, choose a number.
Whenever a creature with exactly the chosen number of words in its name enters the battlefield under your control, draw a card. (Hyphenated words are one word.)

Creatures don't untap during their controllers' untap steps.
Whenever a creature enters the battlefield, untap all creatures.

Whenever a creature with power 4 or greater enters the battlefield, its controller draws a card.

As Kindred Discovery enters the battlefield, choose a creature type.
Whenever a creature you control of the chosen type enters the battlefield or attacks, draw a card.

Whenever a creature enters the battlefield, destroy it.
: Destroy Lethal Vapors. You skip your next turn. Any player may activate this ability.

If Leyline of Vitality is in your opening hand, you may begin the game with it on the battlefield.
Creatures you control get +0/+1.
Whenever a creature enters the battlefield under your control, you may gain 1 life.

Enchant creature
As Loose Lips enters the battlefield, choose a sentence with eight or fewer words.
Enchanted creature has flying.
Whenever enchanted creature deals damage to an opponent, that player may say the chosen sentence. If they don't, you draw two cards.

Whenever a creature enters the battlefield, you may add an amount of equal to the number of creatures you control that share a creature type with it.

As Mangara's Equity enters the battlefield, choose black or red.
At the beginning of your upkeep, sacrifice Mangara's Equity unless you pay .
Whenever a creature of the chosen color deals damage to you or a white creature you control, Mangara's Equity deals that much damage to that creature.

Flash (You may cast this spell any time you could cast an instant.)
Enchant creature
Whenever a creature enters the battlefield, enchanted creature gets +2/+2 until end of turn.

When Marchesa's Decree enters the battlefield, you become the monarch.
Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life.

Whenever Marit Lage's Slumber or another snow permanent enters the battlefield under your control, scry 1.
At the beginning of your upkeep, if you control ten or more snow permanents, sacrifice Marit Lage's Slumber. If you do, create Marit Lage, a legendary 20/20 black Avatar creature token with flying and indestructible.

Whenever a creature with power 5 or greater enters the battlefield under your control, you may put two +1/+1 counters on it.

As Mirrodin Besieged enters the battlefield, choose Mirran or Phyrexian.
• Mirran — Whenever you cast an artifact spell, create a 1/1 colorless Myr artifact creature token.
• Phyrexian — At the beginning of your end step, draw a card, then discard a card. Then if there are fifteen or more artifact cards in your graveyard, target opponent loses the game.

Whenever a nontoken creature enters the battlefield under your control, flip a coin until you lose a flip. For each flip you won, create a token that's a copy of that creature. Those tokens gain haste. Exile them at the beginning of the next end step.