msem-instigator

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

When Gamhaugen Stablehand enters, put a +1/+1 counter on target creature you control. You gain 1 life.

(Transform this if it's not attached to a creature. Pay {R} as a sorcery to unattach it.)
Enchant creature you control
Gamhaugen War Swine's rider gets +1/+1 and has haste.

(Transform this if it's not attached to a creature. Pay {3}{U} as a sorcery to unattach it.)
Enchant creature you control
Gamhaugen Warbeast's rider gets +2/+2 and has flying.

Gangling Titan has menace and deathtouch as long as there are four or more card types among cards in your graveyard.

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

First strike
Noncreature spells with mana value 3 or greater cost {1} more to cast.
Creatures with mana value 3 or greater enter tapped.

First strike
Creatures with power greater than Gao'Wu, Master Soothsayer's power can't attack.

As long as you control five or more creatures, if you would create a token, you may instead create Hu Li, a legendary 4/4 white Fox Spirit creature token with flying and lifelink.

Garden Cherub's power and toughness are each equal to the number of creatures you control.
Garden Cherub can't be blocked by creatures with power 2 or less.

Flash

Trample
Cycling {2} ({2}, Discard this card: Draw a card.)

When Garish Gillian enters, tap target land an opponent controls. That land doesn't untap during its controller's next untap step.
Unveil {3}{U}{R} ({3}{U}{R}: Transform this. Unveil only as a sorcery.)

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.

Whenever a creature attacks, if its toughness is greater than its power, untap it.

Vigilance
Melee (Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked this combat.)
Whenever an opponent attacks you, create a tapped 1/1 white Soldier creature token with melee. Exile that token at the beginning of your next end step.

Enchant creature
Enchanted creature gets -1/-1 and can't block.
Enchanted creature gets an additional -1/-1 for each card named Garrote in your graveyard.

First mate—Your starting deck contains no creature cards. (If this card outside the game is your chosen first mate, you may swap it with a card in your opening hand.)
Prowess
Whenever Garth attacks, look at the top card of your library. If it's an instant or sorcery card, you may cast it. (You still pay its costs.)

{2}{G}, Sacrifice a land: Gashing Panther gains indestructible until end of turn. Tap it.

{1}, Sacrifice Gasoline Canister: It deals 1 damage to any target. If a creature or planeswalker dealt damage this way would die this turn, exile it instead.

Whenever another creature you control enters, put a +1/+1 counter on each creature you control with lesser power or lesser toughness than that creature.

When Gate of Realms enters, you may search your library for a land card, reveal it, and put that card into your hand. If you do, shuffle.
{10}, {T}: Gate of Realms deals 3 damage to any target. This ability costs {1} less to activate for each different name among lands you control.

Whenever you cast a noncreature spell, put a quest counter on Gate to the Beyond.
At the beginning of your upkeep, if there are three or more quest counters on Gate to the Beyond, you draw a card and you lose 1 life. Then if there are six or more quest counters on it, each opponent loses 2 life.

{T}, Pay 2 life: Add {B}.
{T}: Add one mana of any color. Spend this mana only to cast spells from your graveyard or activate abilities of cards in your graveyard.

You may cast Gateblessed Explorer from your graveyard as long as you control three or more creatures.
Whenever another creature dies, each opponent loses 1 life and you gain 1 life.