msem-instigator

Flying
Whenever a player shuffles their library, Gilded Wyvern deals 2 damage to that player.

When Gitaxian Reprocessor enters, if you cast it, choose one —
• Create a token that's a copy of another target creature, except it's an artifact and isn't a creature.
• Create a token that's a copy of target noncreature artifact, except it's a 2/2 creature in addition to its other types.

Harmony — Target creature gains flying until end of turn.
When Glamorous Aerialist enters, harmonize. (Trigger up to one harmony of one permanent you control.)

{2}{W}, Sacrifice Gleamhorn Elk: Destroy target artifact or enchantment.

When Gleamhorn Gargantuan enters, put a +1/+1 counter on up to one other target creature.
Cycling {2} ({2}, Discard this card: Draw a card.)

Whenever you draw your second card each turn, other creatures you control get +1/+1 and gain indestructible until end of turn.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Hexproof
You may have Glen Hunter assign its combat damage as though it weren't blocked.

Trial 3 (As you cast this spell, an opponent of your choice may pay 3 life. If they don't, they fail the trial.)
When Glimmering Prosecutor enters, if the trial was failed, create two 1/1 black Devil creature tokens.

Flying (This creature can't be blocked except by creatures with flying or reach.)
Whenever Glimmerwing Trickster deals combat damage to a player, scry 2.

Flying (This creature can't be blocked except by creatures with flying or reach.)
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Resolute — At the beginning of combat on your turn, if Glisterhorn's power is greater than its base power, tap target creature an opponent controls.

Gloam Gullet gets +1/+1 and has menace as long as you own a land card in exile or in your graveyard.

Attacking creatures you control have first strike.
Whenever three or more creatures you control die, Glorysinger deals 4 damage to any target.

Prismatic — Whenever you cast a multicolored spell, you may discard a card. If you do, draw a card.

Flash
As an additional cost to cast this spell, sacrifice a creature or pay {2}.
Defender

When Goblin Cutpurses enters, target player discards a card, then draws a card.

Prowess
{3}{R}, Sacrifice Goblin Experimenter: Return target sorcery card from your graveyard to your hand.

When Goblin Sniper dies, you may pay {R}. If you do, it deals 2 damage to target opponent or planeswalker.

Haste
Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)
Whenever Goblin War Chariot becomes crewed, untap each creature that crewed it with mana value 1 or less. This ability triggers only once each turn.
Crew 3

When Godseeker Vanguard enters, create two 1/1 green Scout creature tokens.

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.”)

When Goremound enters, target creature you don't control gets -3/-3 until end of turn. All other creatures you don't control with the same name as that creature get -1/-1 until end of turn.
Evoke {1}{B} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)