Cumulus Soundvein enters the battlefield tapped.
When Cumulus Soundvein enters the battlefield, you may pay 1 life. If you do, add one mana of any color other than white.
{T}: Add {W}.

When Cutting Room Floor enters the battlefield, scry 2.
Whenever you scry, you may pay {1}. If you do, target creature gets -X/-X until end of turn, where X is the number of cards you looked at.

When D'Enzo Orsino enters the battlefield, you may search your library for a card named Marie Laurent, a card named Hans Nehmann and a card named Diago Maldovo, reveal them, put them into your hand, then shuffle.
Prevent all combat damage that would be dealt to legendary Allies you control.

Hexproof
When Dakran Shipcrusher enters the battlefield, you may bless target creature.

Flying
When Daybreak Rider enters the battlefield, you may bless another target creature.

When Deathcap Guardian enters the battlefield, exile any number of permanent cards from your graveyard. When you do, put X +1/+1 counters on Deathcap Guardian and up to one target creature gets -X/-X until end of turn, where X is the number of cards exiled this way.

Desolate Soundvein enters the battlefield tapped.
When Desolate Soundvein enters the battlefield, you may pay 1 life. If you do, add one mana of any color other than black.
{T}: Add {B}.

When Diago Maldovo enters the battlefield, you may search your library for a card named Marie Laurent or Hans Nehmann and reveal that card. If you do, shuffle, then put the card on top of it.
Legendary Allies you control have trample.

Flying
When Disaffected Seraph enters the battlefield, you gain X life, where X is the number of creatures with flying you control.

When Disguising Barber enters the battlefield, you may have another target creature you control become a copy of any creature on the battlefield for as long as you control Disguising Barber.

When Dream Catcher enters the battlefield, return target exiled card with flashback you own to your hand.

Multitude {4}{W}{W}
When Drift Off enters the battlefield, exile target nonland permanent you don't control until Drift Off leaves the battlefield.

Deathtouch
When Drudge Dredger enters the battlefield, mill three cards.

When Dryad of the Keen-Eyed enters the battlefield, search your library for a basic Forest card, reveal it, and put it into your hand. If your devotion to green is three or greater, put it onto the battlefield tapped instead.

When Elder Soulblade enters the battlefield, search your library and/or graveyard for a creature card with mana value 2 or less. Put that card onto the battlefield, attach Elder Soulblade to it. If you searched you library this way, shuffle.
Equipped creature gets +3/+1 and has menace.
Equip {5}

When Elderflame Pilgrims enters the battlefield, it deals 2 damage to target player or planeswalker.
Wander {5}{R}

When Electromagnetic Geode enters the battlefield, draw a card.
{2}, {T}, Sacrifice Electromagnetic Geode: Add two mana of different colors.

Flash
Flying
When Electronegative Specialist enters the battlefield, choose a number. You and creatures you control gain protection from mana values equal to the chosen number until end of turn.

When Eltensian Herbalist enters the battlefield, you gain 4 life.

When Elvish Rejuvenator enters the battlefield, look at the top five cards of your library. You may put a land card from among them onto the battlefield tapped. Put the rest on the bottom of your library in a random order.

When Elvish Visionary enters the battlefield, draw a card.

Vigilance, reach
When Enduring Jentil enters the battlefield, create an artifact token named Menhir with “{2}, {T}, Exile a creature or land card from your graveyard: Draw a card. You gain 2 life.”
Whenever Enduring Jentil attacks, you may sacrifice an artifact. If you do, Enduring Jentil deals damage equal to its power to target creature.

When Energizing Static enters the battlefield, target creature gets +3/+3 until end of turn. If that creature is an Elemental, it also gains trample until end of turn.

Enchant creature
When Enrapturing Lights enters the battlefield, untap enchanted creature. It gains haste until end of turn.
You control enchanted creature.

Enchant creature
When Enter the Moshpit enters the battlefield, create a 2/1 red Zombie creature token with menace.
Enchanted creature gets +2/+1 and has menace.