Reach, trample

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)

Whenever another nontoken creature enters the battlefield, you may pay {1}{G}. If you do, that creature's controller creates a token that's a copy of that creature.

Haste

Threshold -- As long as seven or more cards are in your graveyard, Centaur Chieftain has "When Centaur Chieftain enters the battlefield, creatures you control get +1/+1 and gain trample until end of turn."

Whenever you draw a card, put a +1/+1 counter on Chasm Skulker.

When Chasm Skulker dies, create X 1/1 blue Squid creature tokens with islandwalk, where X is the number of +1/+1 counters on Chasm Skulker. (They can't be blocked as long as defending player controls an Island.)

Descend 4 -- When Coati Scavenger enters the battlefield, if there are four or more permanent cards in your graveyard, return target permanent card from your graveyard to your hand.

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 Deadwood Treefolk enters or leaves the battlefield, return another target creature card from your graveyard to your hand.

When Duskshell Crawler enters the battlefield, put a +1/+1 counter on target creature.

Each creature you control with a +1/+1 counter on it has trample.

Trample

When Earthshaker Giant enters the battlefield, other creatures you control get +3/+3 and gain trample until end of turn.

Constellation -- Whenever Eidolon of Blossoms or another enchantment enters the battlefield under your control, draw a card.

When Elvish Visionary enters the battlefield, draw a card.

Vigilance, trample, haste

When End-Raze Forerunners enters the battlefield, other creatures you control get +2/+2 and gain vigilance and trample until end of turn.

Defender

When Gatecreeper Vine enters the battlefield, you may search your library for a basic land card or a Gate card, reveal it, put it into your hand, then shuffle.

When Generous Stray enters the battlefield, draw a card.

Trample

When Gruff Triplets enters the battlefield, if it isn't a token, create two tokens that are copies of it.

When Gruff Triplets dies, put a number of +1/+1 counters equal to its power on each creature you control named Gruff Triplets.

Flying

Whenever Guildpact Informant deals combat damage to a player or planeswalker, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Flying

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)

Flash

Flying

When Ice-Fang Coatl enters the battlefield, draw a card.

Ice-Fang Coatl has deathtouch as long as you control at least three other snow permanents.

Flying

Scavenge the Dead -- When Malanthrope enters the battlefield, exile target player's graveyard. Put a +1/+1 counter on Malanthrope for each creature card exiled this way.

Flying

When Merfolk Skydiver enters the battlefield, put a +1/+1 counter on target creature you control.

{3}{G}{U}: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Trample

Ochre Jelly enters the battlefield with X +1/+1 counters on it.

Split -- When Ochre Jelly dies, if it had two or more +1/+1 counters on it, create a token that's a copy of it at the beginning of the next end step. The token enters the battlefield with half that many +1/+1 counters on it, rounded down.

Trample

When Pelakka Wurm enters the battlefield, you gain 7 life.

When Pelakka Wurm dies, draw a card.

When Purple-Crystal Crab dies, draw a card.

When Ridgescale Tusker enters the battlefield, put a +1/+1 counter on each other creature you control.

Whenever Risen Reef or another Elemental enters the battlefield under your control, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped. If you don't put the card onto the battlefield, put it into your hand.

When Saddleback Lagac enters the battlefield, support 2. (Put a +1/+1 counter on each of up to two other target creatures.)

Flash

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)

You may have Sakashima's Protege enter the battlefield as a copy of any permanent that entered the battlefield this turn.

Flash

Cascade

Reach

When Sweet-Gum Recluse enters the battlefield, put three +1/+1 counters on each of any number of target creatures that entered the battlefield this turn.

Flying

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)

Whenever another creature enters the battlefield under your control, you may pay {2}. If you do, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Trample

When Thundering Ceratok enters the battlefield, other creatures you control gain trample until end of turn.

Flying

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

{3}{U}: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Whenever you cast a creature spell that doesn't share a creature type with a creature you control or a creature card in your graveyard, copy that spell. (A copy of a creature spell becomes a token.)