msem-instigator

{T}: You may tap or untap another target permanent.
Unearth {U} ({U}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the end step or if it would leave the battlefield. Unearth only as a sorcery.)

Gestalt (When this or another creature enters under your control, you may merge it with the one in play, keeping counters and attachments. They become the permanent on top plus all abilities from under it.)
This creature gets +2/+2 as long as it's merged with another card or token.

At the beginning of your upkeep, reveal the top card of your library. If you reveal a creature card this way, put it into your hand.

Haste
Erratic (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order.)

First strike
Sacrifice Fearless General: Soldiers you control gain indestructible until end of turn.

Battalion — Whenever Fellor Bloodseeker and at least two other creatures attack, Fellor Bloodseeker gains lifelink until end of turn.

First strike

Battalion — Whenever Fellor Raider and at least two other creatures attack, Fellor Raider deals 2 damage to defending player.

Trample
Whenever Fellor Razer deals combat damage to a player, that player sacrifices a land.

Harmony — Target creature you control gets +1/+0 and gains first strike until end of turn.
When Fellor War-Skald enters, harmonize. (Trigger up to one harmony of a permanent you control.)

Menace
As long as you control exactly one other creature, that creature gets +1/+1 and has menace.

Reach
{G}, Sacrifice Fencas: Search your library for a land card, reveal it, put it into your hand, then shuffle.
At the beginning of your end step, if you control seven or more lands, return this card from your graveyard to the battlefield.

{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.

Wanderlust — Feral Ornithax gets +2/+2 and has trample as long as you control four or more differently named lands.

When Feralborn Druid enters, create two 2/2 green Wolf creature tokens.
Feralborn Druid gets +1/+1 for each Wolf you control.

When Ferocity of the Redeemed enters, return up to two target creature cards with mana value 1 or less from your graveyard to the battlefield.
Revive {2}{W}{W} ({2}{W}{W}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

{1}, {T}, Move a -1/-1 counter from another creature onto Fervent Arbiter: Exile target creature you don't control until Fervent Arbiter leaves the battlefield.

Chosen one ({W}{U}{B}{R}{G}: Transform this permanent.)
Whenever Fervent Ensign attacks, add {R} at the beginning of your next main phase.

Attacking creatures you control get +1/+0.

{2}{R}{R}, Exile an instant or sorcery card from your graveyard: Fervid Dragonheart gets +1/+2, gains flying, and becomes a Dragon until end of turn.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

When Festering Waif enters, each opponent mills two cards.
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

When Festival Celebrants enters, put a +1/+1 counter on each creature you control.

Inspired — Whenever Festival Decorator becomes untapped, draw a card.

When Festival Rioters enters, create a colorless artifact token named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”
{1}{R}: Festival Rioters gets +2/+0 until end of turn.