msem-instigator

{R}, {T}, Exert Provoker of Mountains: Create an X/X red Elemental creature token, where X is the number of spells you've cast this turn. (An exerted creature won't untap during your next untap step.)
{X}{X}{R}, {T}, Sacrifice Provoker of Mountains: Provoker of Mountains deals X damage to any target.

Trample
Resolute — {G}: Prowling Agamid gets +3/+3 until end of turn. Activate only once each turn and only if Prowling Agamid's power is greater than its base power.

Look at target player's hand. That player discards a card.
{2}{B}{B}, Exile Psychic Assault from your graveyard: Choose a card name. Target player reveals their hand and discards all cards with that name. Activate only as a sorcery.

Defender (This creature can't attack.)
Whenever you cast a spell during an opponent's turn, scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

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

Target player can't cast spells this turn.
Fabled {2}{W}{U} (Then if you cast this for its fabled cost, put it onto the battlefield transformed attached to that player.)

{T}: Add {C}.
{T}, Reappropriate: Add {R} or {G}. (Exile exactly two cards from your hand and/or graveyard.)

Vigilance

{3}, {T}, Sacrifice Punja Stick Trap: Punja Stick Trap deals 2 damage to target creature. Tap it.

Whenever another Fox you control enters, Pup of a Marigold Burrow deals 1 damage to each opponent.

Haste
Whenever you cast an instant or sorcery spell, Pupil of Lightning gets +1/+1 until end of turn. If you cast that spell from your graveyard, put a +1/+1 counter on it instead.

This spell costs {3} less to cast if a creature died this turn.
Put target creature card with mana value X from a graveyard onto the battlefield under your control.

Put a -1/-1 counter on target creature. Purge the Harbor deals 1 damage to that creature's controller.

Enchant creature you control
When Purphoros's Benefaction enters, scry 2.
Enchanted creature gets +1/+1 and has haste.

Enchant creature
When Pursued Paranoia enters, scry 1.
Enchanted creature can't block.

Whenever you cast a cryptic spell, tap up to one target nonland permanent. (Artifacts, enchantments, and modal spells are cryptic.)

Haste (This creature can attack and {T} as soon as it comes under your control.)
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Flying, haste
Whenever Pyrus, the Undying Flame attacks, add {R}{R}{R}{R}. You don't lose this mana as steps, phases, and turns end.
{1}{R}: Pyrus gets +1/+0 until end of turn.

Qi-Long Shrine enters tapped.
{T}: Add {U} or {R}.
{U/R}, {T}, Sacrifice Qi-Long Shrine: Put a +1/+1 counter on target creature you control. Activate only as a sorcery.

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

Target creature you control gets +2/+2 until end of turn. If it's attacking, it gains indestructible until end of turn.

At the beginning of combat on your turn, whenever target creature deals combat damage to a player this turn, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

The next sorcery spell you cast this turn can be cast as though it had flash.
Draw a card.

Reverberate {2} (When you cast this spell, copy it if you paid its reverberate cost.)
Draw a card.

Spells your opponents cast this turn cost {1} more to cast. (Then exile this card. You may cast the creature later from exile.)