msem-instigator

When Lammasu Roost enters, create a 2/2 blue Lammasu creature token with flying.
{3}{U}: Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

Whenever Nightrail Printer attacks, you may tap target creature.

Equipped creature gets +4/+4.
Whenever equipped creature deals combat damage, sacrifice it.
Equip—Sacrifice a creature.

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Reach
When Crater Thing enters, it deals 3 damage to up to one target creature or planeswalker.
Mountaincycling {2} ({2}, Discard this card: Search your library for a Mountain card, reveal it, put it into your hand, then shuffle.)

Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn.
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.)

{T}: Add {C}.
{T}, Tap an untapped creature you control: Add one mana of any color. You gain 1 life.

Exile target permanent. Return that card to the battlefield tapped under its owner's control at the beginning of the next end step.

Put a +1/+1 counter on target creature. That creature gains first strike until end of turn.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, you gain life equal to the greatest power among creatures you control.

Enchant land
Enchanted land has “{T}: Draw a card, then discard a card.”

If you have less life than an opponent, you gain 2 life. If you control fewer creatures than an opponent, create a 1/1 colorless Construct Actor creature token.
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.”)

Equipped creature gets +3/+2.
Equip {4}
Hail of Blades's equip ability costs {4} less to activate if it targets an equipped creature.

Spells your opponents cast cost {2} more to cast for each card with the same name as that spell in that player's graveyard and for each nonland permanent on the battlefield with the same name as that spell.

Flash
When this creature enters, surveil 1, then draw a card.

Exile the top two cards of your library. Until the end of your next turn, you may play those cards.

Vigilance
Lijing has indestructible as long as a Fox you control entered this turn.
Whenever an opponent draws a card, draw a card unless that player has you create a 2/1 red and white Fox creature token.

Griffin Country enters with a feather counter on it.
Creatures with flying you control get +1/+1.
{U}, Remove a feather counter from Griffin Country: Put a flying counter on target creature you control.
{2}{U}, Remove a feather counter from Griffin Country: Search your library for a creature card with flying, reveal it, put it into your hand, then shuffle.

Haste
Ward—Pay 3 life.
{R}, Tap an untapped artifact you control: Drysand Mole gets +1/+0 until end of turn. Up to one target creature can't block it this turn.

{3}{U}{U}: Monstrosity 4. (If this creature isn't monstrous, put four +1/+1 counters on it and it becomes monstrous.)
When Shorecrash Octopus becomes monstrous, return target instant or sorcery card from your graveyard to your hand.

Konoe's Lieutenant gets +1/+1 as long as an opponent controls a legendary permanent.

Virtuoso's Parlor enters tapped.
When Virtuoso's Parlor enters, look at the top card of your library. You may put it into your graveyard.
{T}: Add {W} or {B}.

Menace

Flash
Flying
When Cobblespook enters, tap target artifact or creature an opponent controls.

Target attacking creature gets +3/+3 until end of turn. If it's an artifact creature, it gains trample until end of turn.

Target creature gains haste until end of turn. That creature attacks or blocks this turn if able.