Blightcaster

Whenever you cast an enchantment spell, you may have target creature get -2/-2 until end of turn.

Grim Guardian

Constellation — Whenever this creature or another enchantment you control enters, each opponent loses 1 life.

Shoal Kraken

Constellation — Whenever an enchantment you control enters, you may draw a card. If you do, discard a card.

Humbler of Mortals

Constellation — Whenever this creature or another enchantment you control enters, creatures you control gain trample until end of turn.

Herald of the Pantheon

Enchantment spells you cast cost {1} less to cast.
Whenever you cast an enchantment spell, you gain 1 life.

Nylea's Colossus

Constellation — Whenever this creature or another enchantment you control enters, double target creature's power and toughness until end of turn.

Whitewater Naiads

Constellation — Whenever this creature or another enchantment you control enters, target creature can't be blocked this turn.

Nexus Wardens

Reach
Constellation — Whenever an enchantment you control enters, you gain 2 life.

Thoughtrender Lamia

Constellation — Whenever this creature or another enchantment you control enters, each opponent discards a card.

Thassa's Devourer

Constellation — Whenever this creature or another enchantment you control enters, target player mills two cards.

Protean Thaumaturge

Constellation — Whenever an enchantment you control enters, you may have this creature become a copy of another target creature, except it has this ability.

Setessan Champion

Constellation — Whenever an enchantment you control enters, put a +1/+1 counter on this creature and draw a card.

Doomwake Giant

Constellation — Whenever this creature or another enchantment you control enters, creatures your opponents control get -1/-1 until end of turn.

Argothian Enchantress

Shroud (This creature can't be the target of spells or abilities.)
Whenever you cast an enchantment spell, draw a card.

Setessan Skirmisher

Constellation — Whenever an enchantment you control enters, this creature gets +1/+1 until end of turn.

Dreadbringer Lampads

Constellation — Whenever this creature or another enchantment you control enters, target creature gains intimidate until end of turn. (It can't be blocked except by artifact creatures and/or creatures that share a color with it.)

Tatsunari, Toad Rider

Whenever you cast an enchantment spell, if you don't control a creature named Keimi, create Keimi, a legendary 3/3 black and green Frog creature token with "Whenever you cast an enchantment spell, each opponent loses 1 life and you gain 1 life."
{1}{G/U}: Tatsunari and target Frog you control can't be blocked this turn except by creatures with flying or reach.

Oakheart Dryads

Constellation — Whenever this creature or another enchantment you control enters, target creature gets +1/+1 until end of turn.

Nessian Wanderer

Constellation — Whenever an enchantment you control enters, look at the top three cards of your library. You may reveal a land card from among them and put that card into your hand. Put the rest on the bottom of your library in a random order.

Sage of Mysteries

Constellation — Whenever an enchantment you control enters, target player mills two cards.

Composer of Spring

Constellation — Whenever an enchantment you control enters, you may put a land card from your hand onto the battlefield tapped. If you control six or more enchantments, instead you may put a creature or land card from your hand onto the battlefield tapped.

Kami of Transience

Trample
Whenever you cast an enchantment spell, put a +1/+1 counter on this creature.
At the beginning of each end step, if an enchantment was put into your graveyard from the battlefield this turn, you may return this card from your graveyard to your hand.

Verduran Enchantress

Whenever you cast an enchantment spell, you may draw a card.

Eutropia the Twice-Favored

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

Agent of Erebos

Constellation — Whenever this creature or another enchantment you control enters, exile target player's graveyard.

Strength from the Fallen

Constellation — Whenever this enchantment or another enchantment you control enters, target creature gets +X/+X until end of turn, where X is the number of creature cards in your graveyard.

Goldenhide Ox

Constellation — Whenever this creature or another enchantment you control enters, target creature must be blocked this turn if able.

Generous Visitor

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

Eidolon of Blossoms

Constellation — Whenever this creature or another enchantment you control enters, draw a card.