msem-instigator

Enchant creature
When Child of the Pack enters, create a 2/2 green Wolf creature token.
Enchanted creature gets +1/+1 for each Wolf you control.

Trample
When Contentious Yak enters, another target creature you control gets +1/+1 and gains trample until end of turn.

Deathtouch
{3}{G}: Deathcoil Cobra gains indestructible until end of turn.

{3}{G}: Elder Rootwallas gets +4/+2 until end of turn. Activate only once each turn.

Target creature you control gets +2/+2 and gains trample until end of turn.
Ferocious — You may cast Fierce Howl as though it had flash if you control a creature with power 4 or greater.

When Golden Grizzly enters, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

Look at the top sixteen cards of your library. Put any number of creature cards with different mana values from among them onto the battlefield and the rest on the bottom of your library in any order.

Ferocious — Whenever a creature with power 4 or greater you control enters, you gain 4 life.

At the beginning of your upkeep, put a +1/+1 counter on Heyu, Immortal Hunter.
Whenever Heyu becomes the target of a spell or ability an opponent controls, counter it if Heyu has the greatest power among creatures on the battlefield.

Scry 3, then reveal the top card of your library. If it's a creature card, Hunter's Instinct deals damage to target creature equal to the revealed card's power.
Ferocious — If the revealed card is a creature card with power 4 or greater, put it into your hand.

Distribute three +1/+1 counters among any number of creatures you control.
Metamorph {1}{G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up and cast it at any time for its metamorph cost.)

Ferocious — At the beginning of each combat, if you control a creature with power 4 or greater, Impressible Cub gets +1/+1 until end of turn.

When Naiad of the Glen enters, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)
Naiad of the Glen has trample as long as it has a +1/+1 counter on it.

Destroy target artifact or enchantment with mana value 3 or less.
Ferocious — You gain 4 life if you control a creature with power 4 or greater.

When Savage Savant enters, create a 4/4 green Beast creature token.

Vigilance
Shuye, Forever Watching's power and toughness are each equal to the number of noncreature permanents you don't control.

Whenever Solemn Stag perseveres, put two +1/+1 counters on it. (A creature perseveres when it survives damage.)

Reach
Spined Tarantula gets +1/+1 for each creature with flying your opponents control.

Reach, deathtouch

{2}{G}, {T}: Another target creature you control gets +2/+2 until end of turn.

Choose one or both—
• Target creature you control gets +2/+2 until end of turn.
• Target creature you control fights target creature you don't control. (Each deals damage equal to its power to the other.)

Double strike
{3}{R}{W}: Create Hao'Tai's Blessing, a legendary red and white Aura enchantment token with enchant creature and “Enchanted creature gets +3/+3 and has flying” and attach it to Duan, the Fabled Rider.

{1}{R}{G}: Feral Exemplar gets +2/+2 until end of turn. Activate only once each turn.
Ferocious — Whenever a creature you control with power 4 or greater attacks, that creature gets +X/+X until end of turn, where X is its power.

Hexproof, trample
Whenever Gui, the Islandbringer deals combat damage to an opponent, reveal the top card of your library. If it's a land card, put it onto the battlefield. Otherwise, put it into your hand.

Whenever a non-Serf creature you control enters, create a 0/1 black Serf creature token.
Sacrifice a Serf: Target creature you control gets +0/+1 until end of turn.