msem-instigator

Enchant creature
When Karametra's Touch enters, you gain 2 life.
Enchanted creature gets +2/+2.
When enchanted creature dies, return Karametra's Touch to its owner's hand.

Resolute — At the beginning of combat on your turn, if Glisterhorn's power is greater than its base power, tap target creature an opponent controls.

When Fearless King Shabil enters, reveal the top five cards of your library. You may put a Cat card from among them into your hand. Put the rest on the bottom of your library in any order.
At the beginning of combat on your turn, each Cat you control gains all abilities of each other Cat you control until end of turn.

Flying
Whenever Venerated Sanctity deals combat damage to a player, put a faith counter on it. Then you may pay {X}{W} and sacrifice Venerated Sanctity. When you do, exile target nonland permanent with mana value less than or equal to X plus the number of faith counters on Venerated Sanctity.

Flying, vigilance

Giant's Temple enters tapped.
{T}: Add {G}.
{2}{G}, {T}: Target nonland permanent you control becomes a creature with power and toughness equal to its mana value until end of turn. (It loses all other types.)

Trample
When this permanent transforms into Carnage Demon, each opponent sacrifices a creature.

Whenever an Aura you control enters, untap Fuming Lawmaker.
{1}, {T}: For each opponent, Fuming Lawmaker deals 1 damage to that player or a planeswalker they control. Scry 1.

You may put cards with Adventures that permanents you control explore into your hand as though they were lands. (You won't get the counter if you do.)
At the beginning of each end step, if you cast an Adventure spell or a permanent you controlled explored this turn, create a 1/1 green Scout creature token.

Other creatures you control get +1/+1.
As long as Nobility is in your graveyard and you control a white enchantment, creatures you control get +1/+1.

Whenever a creature you control enters, Timid Thunderhorn gets +X/+X until end of turn, where X is that creature's power.

Choose one or both —
• Riverboat Assault deals 3 damage to target creature.
• Target creature gets +3/+3 until end of turn.

First strike, haste
Play with the top card of your library revealed.
{1}{R}: Darlene gets +1/+0 until end of turn.
Whenever Darlene deals damage to a player, if the top card of your library has mana value equal to the damage dealt, you may cast it without paying its mana cost.

Whenever you make first contact, Oscuran Wingmate gains flying until end of turn. (You make first contact the first time each turn you cast a spell with a name not in your graveyard or control already.)

Target creature gets +3/+3 until end of turn and must be blocked this turn if able.
Showcase {3}{G}{G} (Then if you cast this for its showcase cost, create a 1/1 red Bard creature token that can't block and exile this. Whenever it attacks, you may cast a free copy of this.)

Vigilance
Mountaincycling {1}, plainscycling {1} ({1}, Discard this card: Search your libary for a Mountain or Plains card, reveal it, put it into your hand, then shuffle.)

Menace, haste
As long as Arleigh, Spellblade Prodigy is tapped, the first spell you cast during each other player's turn costs {U/R} less to cast. This effect reduces only the amount of colored mana you pay. (For example, if you cast a spell with mana cost {1}{R}, it costs {1} to cast.)

Draw two cards, then discard two cards.
Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Draw two cards. If you control an Angel, draw three cards instead.

Vigilance
Whenever Glittering Narwhal is dealt damage, create a Treasure token. (It's an artifact with “{T}, Sacrifice this permanent: Add one mana of any color.”)

This spell has flash as long as you control another enchantment.
When Kernel Quarantine enters, exile all other creatures until Kernel Quarantine leaves the battlefield.

Whenever equipped creature deals combat damage to a player, destroy all permanents other than Worldslayer.
Equip {5}

When Uncovered Idol enters, scry 1.
{1}, Sacrifice Uncovered Idol: Put a +1/+1 counter on target creature. Activate only as a sorcery.

{T}: Add {C}.
{4}, {T}, Sacrifice Slyten Crystal Motherlode: Add {W}{U}{B}{R}{G}.

When Miede-District Alchemist enters, add {R}{R}{R}.
Paranoia {1}{R} (You may cast this spell for its paranoia cost when a permanent you control leaves the battlefield.)