msem-instigator

When Gemcrusher Turtle enters, choose one —
• Destroy target artifact.
• Gemcrusher Turtle fights up to one target creature.

When Gemplate Golem enters or dies, put a +1/+1 counter on target creature you control.

Flying
When Gemscale Drake enters, create a Treasure token.
Whenever Gemscale Drake deals combat damage to a player, scry 1. If you control three or more artifacts, draw a card instead.

Whenever you cast a spell with mana value 5 or greater, create an X/1 red Mutant creature token with trample and haste, where X is that spell's mana value. Exile that token at the beginning of the next end step.

When GenTech Architect enters, create a Function token with “Put two +1/+1 counters on a creature you control.” (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)

When GenTech Assistants enters, create an X/X green Mutant creature token.

Once during each of your turns, when you sacrifice a permanent, you may have target opponent lose 3 life unless they sacrifice a nonland permanent or discard a card.

When Gendran Hostess enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.

{T}: Add {C}.
{T}: Choose a color from among permanents you control. Add one mana of that color.

Whenever a creature you control 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.”)
{2}, Sacrifice an Idol: Creatures you control get +1/+1 until end of turn.

Enchant creature
Enchanted creature and other creatures you control that share a creature type with it get +1/+1 and have vigilance.

Generative Edge enters tapped.
{T}: Add {G} or {U}.
{G}{U}, {T}, Sacrifice Generative Edge: Conjure a card named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)

When Generous Hermit dies, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Target creature gets +X/+X and gains trample until end of turn.
If you've sacrificed a permanent this turn, draw a card.

Up to two target creatures each get +X/+X until end of turn. They must be blocked this turn if able.

When Genome Mapper enters, create a Function token with “Create an X/X green Mutant creature token, where X is this spell's mana value.” (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)

Reach
Prismatic — Whenever you cast a multicolored spell, you gain 2 life.

Choose one —
• Creatures your opponents control get -1/-1 until end of turn.
• Harmonize twice. (To harmonize, trigger up to one harmony of a permanent you control.)

Discard up to two cards, then draw that many cards.
Acquiesce (If you cast this spell from your hand, exile it as it resolves. When one or more creatures you control deal combat damage to an opponent, you may cast this card from exile without paying its mana cost.)

When Gharsha, Monstrous Quarry enters, each opponent creates a 1/1 green Elf creature token.
Whenever a creature you control becomes blocked, you may pay {1}. If you do, put a +1/+1 counter on that creature.

Return target creature card from your graveyard to the battlefield. If you control a Demon, each opponent loses 3 life.

Ghastly Castle enters tapped unless another player controls a land that could produce {U} or {B}.
{T}: Add {U} or {B}.

Deathtouch
When Ghastly Scorpion dies, you draw a card and you lose 1 life.

Creatures can't attack you or a planeswalker you control unless their controller pays {2} for each of those creatures.
Creatures can't block Ghastly Scraper unless their controller pays {2} for each of those creatures.