Soul Warden

Whenever another creature enters, you gain 1 life.

Plains

Elvish Visionary

When Elvish Visionary enters, draw a card.

Psychic Corrosion

Whenever you draw a card, each opponent mills two cards.

Cleric Class

(Gain the next level as a sorcery to add its ability.)
If you would gain life, you gain that much life plus 1 instead.
{3}{W}: Level 2
Whenever you gain life, put a +1/+1 counter on target creature you control.
{4}{W}: Level 3
When this Class becomes level 3, return target creature card from your graveyard to the battlefield. You gain life equal to that creature's toughness.

Spirited Companion

When Spirited Companion enters, draw a card.

Teferi's Tutelage

When Teferi's Tutelage enters, draw a card, then discard a card.
Whenever you draw a card, target opponent mills two cards. (They put the top two cards of their library into their graveyard.)

Sphinx's Tutelage

Whenever you draw a card, target opponent mills two cards. If two nonland cards that share a color were milled this way, repeat this process.
{5}{U}: Draw a card, then discard a card.

Ice-Fang Coatl

Flash
Flying
When Ice-Fang Coatl enters, draw a card.
Ice-Fang Coatl has deathtouch as long as you control at least three other snow permanents.

Wall of Omens

Defender
When Wall of Omens enters, draw a card.

Jace's Erasure

Whenever you draw a card, you may have target player mill a card.

Island

Wall of Blossoms

Defender
When Wall of Blossoms enters, draw a card.