msem-instigator

Menace
Stalker of Myth gets +1/+0 for each creature you control with chronicle.
{2}, Remove a counter from a permanent you control: Draw a card, then discard a card.

Stalwart Guardian has first strike as long as it's attacking.
Augmented — When Stalwart Guardian enters, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, create two 1/1 blue Elemental creature tokens with flying.

Flying, first strike, lifelink
When Stalwart Seraph enters, untap all creatures you control.

Trample
Other creatures you control with trample get +2/+2.
{4}{R}{G}: Put a trample counter on target creature.

This spell costs {1} less to cast if it targets an embattled creature. (A creature is embattled if it has a counter on it or a permanent you control attached to it.)
Put two +1/+1 counters on target creature you control and untap it. It gains hexproof and trample until end of turn.

Target creature you control gets +0/+6 until end of turn and can block an additional creature this turn. Untap it.

Target creature you control gains indestructible until end of turn. If that creature is a Scout, you gain 1 life for each land you control.

Until end of turn, creatures and artifacts you control gain “{T}: Tap target permanent.”

If a card would be put into an opponent's graveyard from anywhere, instead that card is revealed and put on the bottom of that player's library.
Unveil {3}{G}{W} ({3}{G}{W}: Transform this. Unveil only as a sorcery.)

Other creatures you control named Starfall Dancer get +2/+2.

You gain 4 life. Then if {R} was spent to cast Starglare, it deals 4 damage to up to one target creature.

Whenever Starlight Emissary harnesses a spell, draw a card.

When you unveil Starlight Guardian, you may put target card from your graveyard on top of your library.
If a card would be put into an opponent's graveyard from anywhere, exile that card instead.

Flash
Enchant creature
Enchanted creature gets +1/+1 for each enchantment you control.

At the beginning of your end step, you may sacrifice a permanent. When you do, return target creature card from your graveyard to your hand.

Exile target nonland permanent. As long as it remains exiled, its owner may return it to the battlefield any time they could cast an instant. If you control that permanent, you may activate its loyalty abilities any time you could cast an instant during that turn.

Augmented — If you've spent {W}{U}{B}{R}{G} to cast spells this turn, you may play Start Over without paying its mana cost.
Put target creature or planeswalker on the bottom of its owner's library.

Flash (You may cast this spell any time you could cast an instant.)
When Stasis Snare enters, exile target creature an opponent controls until Stasis Snare leaves the battlefield.

You may pay {2}{W} and tap an untapped Cleric you control rather than pay this spell's mana cost.
Exile target artifact, creature, or enchantment. You gain life equal to its mana value.

Equipped creature has menace.
Sacrifice an artifact or enchantment: Equipped creature gets +2/+2 until end of turn.
Equip {1}

Prowess
Whenever Steamwalker attacks, you may discard a card. If you do, draw a card, then catalyze. (The next spell you cast this turn costs {1} less to cast.)

(Transform this if it's not attached to a creature. Pay {2}{U} as a sorcery to unattach it.)
Enchant creature you control
Steed of the Loch's rider gets +2/+1.
Whenever Steed of the Loch's rider attacks, you may tap target creature an opponent controls.

Flying

When Steelscribed Katana enters, you may attach it to target creature you control.
Equipped or inscribed creature gets +2/+1.
Equip {3}
Inscribe {7} ({7}: Exile this card from your hand inscribed on a creature you control. Whenever that creature attacks, its controller may cast a copy of the inscribed card without paying its mana cost. Inscribe only as a sorcery.)

Exile two target creatures, planeswalkers and/or enchantments, then return one of those cards to the battlefield under its owner's control.