msem-instigator

Fang Den Jaws enters the battlefield tapped unless you played it from exile.
{T}: Add {R} or {G}.

[+1]: Add {R} or {G}.
[–1]: Fatresya deals 2 damage to target creature. That creature can't block this turn.
[–5]: You get an emblem with “Creatures you control get +2/+2 and have haste and trample.”

{R/G}: Fento, Nova Crusader gains haste and trample until end of turn.
Whenever Fento, Nova Crusader attacks, you may put a creature card from your hand onto the battlefield tapped and attacking. If you do, sacrifice that creature at the beginning of the next end step.

{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.

Colossal 3—{4}{R}{G} (You may cast this for its colossal cost to have it enter with three +1/+1 counters; or pay {4}{R}{G} as a sorcery: Put three +1/+1 counters on it if it has none.)
Each creature you control with a counter on it can't be blocked by more than one creature.

Whenever Fireheart Centaur attacks, you may pay {2}{R}. If you do, it gets +1/+0 until end of turn for each Centaur you control.

First strike, haste
Other creatures you control with flash or haste have first strike.

{3}{R}: Target creature can't block this turn.

({T}: Add {R} or {G}.)
Flourishing Crevasse enters the battlefield tapped unless you control a basic Mountain or a basic Forest.

{T}, Pay 1 life: Add {R} or {G}.
{1}, {T}, Sacrifice Forgotten Shrine: Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

When Forserval enters the battlefield, creatures you control get +1/+1 and gain haste until end of turn.

Whenever you sacrifice another permanent, Fretport Mob gets +1/+1 and gains haste until end of turn.

Frigid Highlands enters the battlefield tapped unless you control an Island.
{T}: Add {R} or {G}.

As Game Trail enters the battlefield, you may reveal a Mountain or Forest card from your hand. If you don't, Game Trail enters the battlefield tapped.
{T}: Add {R} or {G}.

Ganzorig's Domain enters the battlefield tapped.
When Ganzorig's Domain enters the battlefield, you may mill two cards.
{T}: Add {R} or {G}.

Once each turn, when you cast a creature spell, you may copy it for each other spell you cast this turn. (A copy of a creature spell becomes a token.)
Whenever Garragrok, Horde Tyrant attacks, add {R}{R}{G}{G}. Until end of turn, you don't lose this mana as steps and phases end.

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 and has trample as long as it's merged with another card or token.

({T}: Add {R} or {G}.)
Glittering Grove enters the battlefield tapped.
Cycling {2} ({2}, Discard this card: Draw a card.)

Whenever Glorybound Chorister attacks, put a +1/+1 counter on each other attacking creature you control.

When Goriana Earthshaker enters the battlefield, you may untap target land you control. It becomes a 3/3 Elemental creature with haste until end of turn. It's still a land.

Grizzled Den enters the battlefield tapped.
{T}: Add {R} or {G}.
{3}{R}{G}: Until end of turn, Grizzled Den becomes a Bear creature with trample in addition to its other types.
Scavenge {4}{R}{G}

When Gruff Smith enters the battlefield, you may destroy target artifact. If you do, that artifact's controller creates a colorless Equipment artifact token with “Equipped creature gets +1/+1” and equip {1}.
Recite {1}{R} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters the battlefield or if it would leave the battlefield.)

{T}: Add {C}.
{T}, Exile two cards from your graveyard: Add {R} or {G}.

Alpha (You may have this creature enter the battlefield with a +1/+1 counter on it. If you do, it becomes alpha and can only attack alone.)
Whenever a creature you control attacks alone, target creature an opponent controls blocks this turn if able.

Flying
As long as you control an equipped creature, Guide of Heroes gets +1/+1 and has first strike.
As long as you control an enchanted creature, Guide of Heroes gets +1/+1 and has vigilance.