msem-instigator

Choose two or four —
• Return target nonland permanent to its owner's hand.
• Each player sacrifices a creature.
• Each player sacrifices a noncreature, nonland permanent.
• Conjure a card named Fatigue and put it on top of your library. (It's a colorless sorcery that costs {2} with “Draw a card.”)

When Journeying Packmaster enters, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped. If you didn't put that card onto the battlefield, draw a card.

Improve {R} ({R}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
Whenever Galdurheim Reaver attacks, it deals damage to the player or planeswalker it's attacking equal to the number of embattled creatures you control. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)

Destroy target creature with power equal to its toughness.

Flying
Crew 2 (Tap any number of creatures you control with total power 2 or greater: This Vehicle becomes an artifact creature until end of turn.)

Tap two untapped Elves you control: Add {G}{G}.
{6}{G}{G}: Create an 8/8 green Elemental creature token.

Flying
Welkin Tern can block only creatures with flying.

When Doomed Widow dies, create a 1/1 white Spirit creature token with flying.

Whenever another creature you control enters, target instant or sorcery card in your graveyard with mana value less than or equal to that creature's power gains flashback until end of turn. The flashback cost is equal to its mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.)

Trample
Whenever a creature you control leaves the battlefield, if it had counters on it, put those counters on Golna's Heart.

Whenever Roaring Illusion attacks alone, for each other creature you control, create a token that's a copy of that creature and that's tapped and attacking. Exile those tokens at the beginning of the next end step.

When Hinode, the Sacred Summit enters, draw a card, then choose a creature card name.
Creatures you control with the chosen name have flying, vigilance, and lifelink.

Flying

Lifelink
Vitality of Blossoms has indestructible as long as your life total is greater than your starting life total.

Menace (This creature can't be blocked except by two or more creatures.)
Avatar of Basat can't block.

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.)

When Aetherite Vein enters, scry 1.
{U}, Sacrifice Aetherite Vein: Return target creature to its owner's hand.

Whenever you put one or more -1/-1 counters on one or more creatures, each opponent loses 1 life and you gain 1 life.

Infiltrate (Whenever one or more attacking creatures you control aren't blocked, this creature gets +1/+1 until end of turn.)
Other creatures you control have infiltrate.

Whenever Battle-Scarred Combatant attacks or blocks, put a -1/-1 counter on it.

Lifelink
Whenever one or more other creatures with power 2 or less you control enter, you gain 1 life. If your life total is greater than your starting life total, draw a card instead. This ability triggers only once each turn.

{T}: Add {C}.
{1}, {T}: Add one mana of any color.

Flash (You may cast this spell any time you could cast an instant.)
When Majestic Hippocamp enters, target creature gets -2/-0 until end of turn.

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Draw four cards. Until your next turn, creatures can't attack you. Exile Vantage Point.