msem-instigator

Sabotage — Whenever an opponent or permanent an opponent controls becomes the target of a spell you control, return target creature card with mana value 3 or less from your graveyard to the battlefield.

Exile target nonland card with mana value 2 or less from your graveyard. Copy it. You may cast the copy without paying its mana cost.
Exile Breach the Lilies.

Whenever Perfecting Forgemaster enters or attacks, you may sacrifice an artifact. If you do, look at the top six cards of your library. You may reveal an Equipment card from among them. Put it onto the battlefield if its mana value is less than or equal to the sacrificed artifact's mana value. Otherwise, put it into your hand. Then shuffle.

Draw a card, then copy target activated or triggered ability you don't control. You may choose new targets for the copy.
Exile Confirm Hypothesis.

Whenever another Goblin you control attacks, you may pay {1}. If you do, it gets +1/+0 until end of turn.

Vigilance
{4}{U}: Draw a card.

Enchant creature
Enchanted creature gets +1/+0 and has trample and reach.

When Reclamation Sage enters, you may destroy target artifact or enchantment.

Equipped creature gets +2/+2.
Art of war — At the beginning of your end step, if equipped creature dealt damage to an opponent this turn, target nonbasic land an opponent controls doesn't untap during its controller's next untap step.
Equip {2}

Enchant creature
Enchanted creature can't become untapped.
{4}{U}: Return Frozen Halo and enchanted creature to their owners' hands.

Vigilance, lifelink

When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy.
Agonize (You may cast this card from your graveyard by putting a -1/-1 counter on a creature you control in addition to paying its other costs. Then exile this card.)

When Arisen Troops dies, you may destroy target creature that was dealt damage this turn.

Whenever you cast a spell from your graveyard, you may return target nonland permanent to its owner's hand.
Sacrifice a Clue: Return Trespasser of the Gallows from your graveyard to your hand.

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

Return target instant or sorcery card from your graveyard to your hand.
Draw a card.

When Remembrance of Light enters, you may return target permanent card from your graveyard to your hand.
Revive—{4}{G}, Discard a card. ({4}{G}, Discard a card, 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.)

Flying
Whenever another creature you control enters, you may have Waxing Celestial get +1/+1 until end of turn.

If an opponent controls three or more attacking creatures, you may cast this spell as though it had flash.
Firewall Trap deals 5 damage to target creature. When that creature dies this turn, Firewall Trap deals damage equal to that creature's power to another target creature.

Foretell {B} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)
Destroy target creature or planeswalker. You lose 4 life unless this spell was foretold.

When Primordial Progenitor dies, create two 1/1 red Elemental creature tokens.

({T}: Add {B} or {R}.)
Whenever Crumbling Precipice becomes tapped, you lose 1 life unless you control two or more basic lands.

Take an extra turn after this one.
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.”)

{1}{B}, Exile a creature or land card from your graveyard: Return Rotwood Whisper from your graveyard to the battlefield tapped.