msem-instigator

Flying
{3}{R}{R}: Untap all creatures you control. After this main phase, there is an additional combat phase followed by an additional main phase. Activate only any time you could cast a sorcery.

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.

Go Out Guns Blazing deals 2 damage to target player or planeswalker.
Compose (Then if you cast this from your hand, exile it and create a Saga token with “r3—You may cast a copy of this card from exile without paying its mana cost.”)

When Goblin Arsonist dies, you may have it deal 1 damage to any target.

Haste
Encourage ({T}: Another target creature you control gets +1/+1 until end of turn. Encourage only as a sorcery.)

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.

Goblin Exploration Team gets +1/+0 for each non-Mountain land you control.

Whenever Goblin Raidleader attacks, create a 1/1 red Goblin creature token that's tapped and attacking.
{1}{R}: Other Goblins you control get +1/+0 until end of turn.

When Goblin Rocktosser enters, you may sacrifice a land. If you do, put a +1/+1 counter on Goblin Rocktosser.

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

First strike (This creature deals combat damage before creatures without first strike.)

Whenever you cast an instant or sorcery spell, target creature can't block this turn.

{T}: Target creature with power 2 or less can't be blocked this turn.

When Goblin Twinblades enters, create a 1/1 red Goblin creature token.

Shuffle your library, then exile the top two cards. Until end of turn, you may play one of those cards. Whenever you play a card exiled with Goddess' Whimsy this turn that doesn't share a card type with another card played this way, repeat that process.

This spell costs {1} less to cast for each permanent you control that's a Dragon or a Hound.
Flying, haste
Whenever Gold Retriever attacks, abound. (You may cast a nonland card that costs less than this from your hand without paying its mana cost.)

Haste (This creature can attack and {T} as soon as it comes under your control.)
Motivate 2 (When this creature enters, you may motivate target creature with less power than this by putting two +1/+1 counters on it.)

Flying
Grandstanding Huma can block only creatures with flying.
{2}{R}{R}, Exile three instant and/or sorcery cards from your graveyard: Return Grandstanding Huma from your graveyard to the battlefield tapped and attacking. Activate this ability only during your declare attackers step.

When you cast this spell, each other player may copy it.
Exile the top seven cards of an opponent's library. Until the end of your next turn, you may play those cards, and you may spend mana as though it was mana of any type to cast those spells.

Draw two cards, then discard two cards.
Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Whenever you attack, put a hatching counter on Greatwyrm's Egg. Then you may sacrifice it. If you do, create a tapped and attacking X/X red Dragon creature token with flying and haste, where X is the number of hatching counters on Greatwyrm's Egg.

Whenever Greenscale Bully deals combat damage to a player, create a Treasure token. (It's an artifact with “{T}, Sacrifice this permanent: Add one mana of any color.”)