msem-instigator

Return a permanent you control to its owner's hand.
Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Put a +1/+1 counter on target creature.
Flashback {1}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Whenever a creature you control enters, it gets +2/+1 until end of turn.

If you would choose one or more modes, you may choose an additional mode. (Modal spells and abilities are indicated by • listed modes.)
{1}, {T}: Add one mana of any color.
{6}, {T}: Add {W}{W}{U}{U}{B}{B}{R}{R}{G}{G}.

Noxious Garden enters tapped.
As Noxious Garden enters, choose a color other than black.
{T}: Add {B} or one mana of the chosen color.

Oathbreaker Orc attacks each combat if able.
Whenever Oathbreaker Orc attacks, it deals 2 damage to defending player unless that player sacrifices a permanent.

Okrophore's power and toughness are each equal to the number of colorless cards in your graveyard.

Play with the top card of your library revealed.
Whenever you draw a card, destroy each creature with the same mana value as that card.

Whenever you cast a noncreature spell, creatures you control get +1/+1 until end of turn.

Search your library for up to six cards and exile them face down. Shuffle, then draw a card.

Each player mills three cards.
Draw a card.

Whenever another nonland permanent you control enters, return that permanent to its owner's hand at the beginning of the next end step.

Defender
Whenever another creature you control enters, Orphan of the Nav gets +1/+1 until end of turn and can attack as though it didn't have defender this turn.

Flash
When Outland Alchemist enters, return another permanent you control to its owner's hand.

Overgrown Ruins enters tapped.
As Overgrown Ruins enters, choose a color other than green.
{T}: Add {G} or one mana of the chosen color.

All damage that would be dealt to target creature you control this turn is dealt to another target creature you control instead. Both those creatures get +1/+1 until end of turn.
Flashback {1}{W} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

{T}: Target player loses 1 life.
Whenever you cast a spell from your graveyard, untap Paincaller.

At the beginning of your upkeep, look at the top card of your library. If it's an artifact or enchantment card, you may reveal it and put it into your hand. Otherwise, you may put it on the bottom of your library.
If you would begin a combat phase, you may skip that phase and begin an additional upkeep step instead.

Whenever an artifact or enchantment you control enters, target player mills two cards.

As long as your deck contains only white and colorless cards, your minimum deck size is reduced by eight.

Whenever you cast an instant spell during your main phase, copy that spell. You may choose new targets for the copies.

Double strike

Whenever Pelaski Valiant becomes tapped, target creature gets +1/+1 until end of turn.

Whenever Penny and Pete attacks, gain control of up to one target noncreature permanent and up to one target creature until end of turn. Untap the noncreature permanent, then tap the creature. It's attacking.

Return Portal to the Unknown to its owner's hand: Add {U}{U}{U}. The next card you cast this turn can be cast as though it had flash.