msem-instigator

Scrap, the Second Myr has all activated abilities of other artifact creatures you control.

Enchant creature
When Lost to the Elements enters, if enchanted creature isn't in a pack, tap it. (Two or more creatures with the same controller and equal power are in a pack.)
Enchanted creature doesn't untap during its controller's untap step.

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

{1}{R}, {T}, Sacrifice a land: Create a colorless Desert land token with “{T}: Add {C}.”
{1}{R}, {T}, Sacrifice a Desert: Destroy up to two target lands.

Whenever you cast a noncreature spell, up to one target artifact or non-Aura enchantment you control becomes a 3/3 creature in addition to its other types until end of turn.

(Add a quest counter as this enters. Sacrifice after 6.)
Whenever you cast a permanent spell, add a quest counter.
1, 2, 3, 4, 5 — Choose a color that hasn't been chosen. Search your library for a permanent card that's exactly that color, reveal it, and put it into your hand. Then shuffle.
6 — Exile Collect the World Stones. For the rest of the game, you may spend mana as though it were mana of any color.
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Flying
Whenever an embattled creature you control deals combat damage to a player, draw a card. (A creature is embattled if it has a counter on it or a permanent you control attached to it.)

Distant Path enters tapped unless you control one or fewer other lands.
{T}: Add {W} or {U}.
Cycling {2} ({2}, Discard this card: Draw a card.)

Whenever Dissenting Vikings attacks, if you control another Warrior, it gets +1/+0 until end of turn and deals 1 damage to defending player.

Menace
When OM-6 Walker dies, OM-6 Walker deals damage to each player equal to twice the number of nonbasic lands that player controls.

Deathtouch
Whenever you lose life, you may cast target black noncreature card in your graveyard this turn. If it would be put into a graveyard from anywhere this turn, exile it instead.
Whenever you gain life for the first time each turn, create a 1/1 black Actor creature token.

Other Goblins you control get +1/+0 and have menace.

Trample
Whenever this creature enters or transforms into Valseid, Leyran Brute, it deals 2 damage to any target that isn't a blocking creature and you gain 2 life.
{3}{R}{G}: Transform Valseid, Leyran Brute. Activate only if it's attacking.

{2}{B}, Exile a card from your graveyard: Tomb Creeper gets +2/+2 until end of turn.

When Bridled Narwhal enters, you gain 5 life.

Flying, haste
Whenever you attack with three or more creatures, harmonize three times. (To harmonize, trigger up to one harmony of a permanent you control.)
If you would harmonize, you may instead return Herald of Festivities from your graveyard to your hand.

Exile target artifact or creature.

When Feralborn Druid enters, create two 2/2 green Wolf creature tokens.
Feralborn Druid gets +1/+1 for each Wolf you control.

Up to one target creature gets -2/-2 until end of turn. Put a +1/+1 counter on up to one target creature you control.

Land creatures you control get +1/+1 and have vigilance.
Enchantment creatures you control get +1/+1 and have lifelink.
Artifact creatures you control get +1/+1 and have flying.

Dead-Set Duo can't block.
Whenever Dead-Set Duo deals combat damage to a player, you may pay {B} and sacrifice it. If you do, they discard two cards.

Apothecary's Gift deals 5 damage to target creature or planeswalker. You gain life equal to the excess damage dealt this way.

Precursor Sanctum enters tapped. When it does, look at the top three cards of your library, exile one face down, then put the rest on the bottom of your library in any order.
{T}: Add {C}.
{4}, {T}: You may play the exiled card without paying its mana cost. Activate only as a sorcery.

Target creature you control gets +2/+0 until end of turn. It fights target creature you don't control. (Each deals damage equal to its power to the other.)