When "Centaur Student Advisor" enters the battlefield, you may put an enchantment card from your graveyard on top of your library. If you do, you gain life equal to that card's converted mana cost.

Whenever you cast a spell, note the first letter of its artist's name. If that letter wasn't already noted, put a +1/+1 counter on Abstract Iguanart.

Flying

Flying
Whenever you cast a historic spell, scry 1. (Artifacts, legendaries, and Sagas are historic. To scry 1, look at the top card of your library, then you may put that card on the bottom of your library.)

If you would gain life, you gain twice that much life instead.

Whenever you cast a silver-bordered spell, put a +1/+1 counter on Border Guardian.
Whenever you cast a black-bordered spell, Border Guardian can't be blocked this turn.
Whenever you cast a white-bordered spell, Border Guardian gains double strike until end of turn.

Roll a six-sided die. Create a number of 1/1 red Goblin creature tokens equal to the result.

Target noncreature artifact you control becomes a 0/0 artifact creature. Put four +1/+1 counters on it.

Vanishing 3 (This creature enters the battlefield with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
When Deep Forest Hermit enters the battlefield, create four 1/1 green Squirrel creature tokens.
Squirrels you control get +1/+1.

Look at the top seven cards of your library. Put two of them into your hand and the rest on the bottom of your library in a random order.

, : Move a counter from one permanent onto another. If the second permanent refers to any kind of counter, the moved counter becomes one of those counters. Otherwise, it becomes a +1/+1 counter.
, : Put a +1/+1 counter on target creature.
, : Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

, : Move a counter from one permanent onto another. If the second permanent refers to any kind of counter, the moved counter becomes one of those counters. Otherwise, it becomes a +1/+1 counter.
, : Put a +1/+1 counter on target creature.
, : Proliferate. (You choose any number of permanents and/or players with counters on them, then give each another counter of a kind already there.)

, : Draw a card. Activate this ability only if you have no cards in hand.
, : You gain 10 life.
, , Sacrifice Everythingamajig: You may put a silver-bordered permanent card from your hand onto the battlefield.

: Flip a coin. If you win the flip, add . Activate this ability only any time you could cast an instant.
, : Target player discards a card. Activate this ability only during your turn.
: Everythingamajig becomes an X/X Construct artifact creature until end of turn.

: Add one mana of any color.
, : Say the flavor text on a card in your hand. Target opponent guesses that card's name. You may reveal that card. If you do and your opponent guessed wrong, draw a card.
, : Everythingamajig deals 12 damage to target creature.

Sacrifice a land: You gain 2 life.
Sacrifice a creature: Add .
, Discard a card: Search your library for a card that shares a complete word in its name with the name of the discarded card, reveal it, put it into your hand, then shuffle your library.

, : Scry 2.
, , Pay 1 life: Create a 0/1 white Goat creature token.
, , Sacrifice Everythingamajig: Choose target player. At the beginning of the next end step, exchange life totals with that player, exchange control of all permanents you and that player control, and exchange cards in your hands, cards in your libraries, and cards in your graveyards.

When Exclusion Mage enters the battlefield, return target creature an opponent controls to its owner's hand.

Draw a card, then each other player may draw a card. Whenever a card is drawn this way, Explosion of Riches deals 5 damage to target opponent chosen at random from among your opponents.

When Forerunner of the Heralds enters the battlefield, you may search your library for a Merfolk card, reveal it, then shuffle your library and put that card on top of it.
Whenever another Merfolk enters the battlefield under your control, put a +1/+1 counter on Forerunner of the Heralds.