Defender, trample
At the beginning of combat on your turn, if you have at least 3 life more than than your starting life total, Thawing Yeti loses defender until end of turn. Otherwise, you gain 2 life.

Vigilance, reach
When Thundering Serpent enters the battlefield, you gain 6 life.

When Towering Sentinel enters, for each kind of counter among permanents you control, put a counter of that kind on Towering Sentinel, then add {G} or {U}.

Menace
Drop — Whenever Avatar of the Decks or another creature enters the battlefield under your control, if the entering creature was cast, sacrifice a permanent unless you didn't cast any creature spells during your last turn.

Haste
Drop — Whenever Avatar of the Moshpit or another creature enters the battlefield under your control, if the entering creature was cast and you didn't cast any creature spells during your last turn, discard your hand, then draw three cards.

Reach
Drop — Whenever Avatar of the Rave or another creature enters the battlefield under your control, if the entering creature was cast and you didn't cast any creature spells during your last turn, return up to two target cards from your graveyard to your hand.

Flash
Ward {3}
You may reveal the second card you draw each turn as you draw it. When you do, you may cast it without paying its mana cost. If you didn't cast a spell this way, create two Treasure tokens.

Ward {X}, where X is the number of differently named lands you control.

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

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.

Escargoliath has deathtouch as long as it's your turn.

Vigilance
Whenever an opponent attacks with three or more creatures, you may have Eternal Sentinel become an artifact creature until end of turn.
Spellcharge 3

If you have more life than your starting life total, this spell costs {X} less to cast, where X is equal to the difference.
Trample
When Glacier Guardian enters the battlefield, you may have it fight target creature you don't control.

At the beginning of your end step, if you cast no spells this turn, surveil 1.
Spellcharge 6

This spell can't be countered.
Flying, ward {3}
Whenever Hoarding Culebre enters the battlefield or attacks, draw a card. Then if you have five or more cards in hand, create a Treasure token.

Trample
When Hunger's Door enters the battlefield, you may return target Aura card from your graveyard to the battlefield attached to Hunger's Door.

{VP}{VP}{VP}: Reveal the top seven cards of your library. You may have Iconic Hologram become a copy of a legendary creature card revealed this way until end of turn. Put the revealed cards on the bottom of your library in a random order.

Vigilance
When Indomitable Jicru enters the battlefield, you gain 5 life and draw a card. If it wandered, creatures you control get +2/+2 until end of turn.
Wander {6}{G}{W}

Indestructible
As long as your devotion to green and white is less than seven, Karametra isn't a creature.
Enchantments and enchanted permanents you control have “When this permanent becomes tapped for the first time during each of your turns, untap it.”

Trample
When Lumbering Foeslayer enters the battlefield, it deals damage equal to its power to each opponent, each planeswalker, and each other creature.

Trample
Mercurial Wright gets +1/+0 for each other artifact you control.
{2}: Target permanent becomes an artifact in addition to its other types until end of turn.

Whenever Phlage enters the battlefield or attacks, Phlage deals 2 damage to any target and you draw a card.
{2}{U}{R}: Return Phlage from your graveyard to the battlefield, then put it on the bottom of its owner's library. Activate only as a sorcery.

As an additional cost to cast spells during an opponent's turn, you may pay {U} and reveal Promethean Jaxl from your hand. If you do, you get a lurk counter.
Flash
Promethean Jaxl enters the battlefield tapped.
When Promethean Jaxl enters the battlefield, you draw a card for each lurk counter you have, then you lose all lurk counters.

This spell costs {1} less to cast for each card in exile you don't own.
Trample
When Proto-Class Behemoth enters, exile up to one target creature.

Scarred Primeval has vigilance and trample as long as you're ancient.