msem-instigator

At the beginning of combat on your turn, if you control a creature with power greater than Ever-Gnawing Rat's, put a +1/+1 counter on Ever-Gnawing Rat.

Whenever you cast an instant or sorcery spell, you may exile that card instead of putting it anywhere else as it resolves.
At the beginning of your upkeep, Clash Reactor deals X damage to each opponent, where X is the number of colors of cards exiled with Clash Reactor.

Trample
Whenever a lore counter is put on a Saga you control, Chimperial Guard gets +2/+2 until end of turn.

Add three mana of any one color.

Whenever Vanguard of the Barricade attacks, tap up to one target creature defending player controls and untap up to one other target creature you control.

When Guardian of the Wurm enters, create a 6/6 green Wurm creature token with trample.

{T}: Put target permanent you own on the bottom of your library.
{1}, {T}: Add one mana of any color. When that mana is spent, target opponent loses 1 life.

Menace
At the beginning of your end step, Mountain Tyrant deals 1 damage to each creature you don't control.

Target permanent you control gains hexproof and indestructible until end of turn. You gain 2 life.

At the beginning of your upkeep, you may discard a card. If you do, draw a card.
At the beginning of your end step, Choking Dunes deals X damage to any target, where X is the number of land cards in your graveyard.

Target creature gets +X/+0 and gains trample until end of turn.

Enchant creature
As Hunter's Distinction enters, you may tap enchanted creature if it's untapped. When you do, put three -1/-1 counters on target creature with flying.
Enchanted creature gets +3/+2 and has reach.

Battalion — Whenever Barbarian Rager and at least two other creatures attack, Barbarian Rager gets +2/+0 until end of turn.

Exotic Xenoreef enters tapped unless you have two or more opponents.
{T}: Add {G} or {U}.

When The Clocktower Project enters, create a tapped colorless Powercell artifact token with “{T}: Add {C}.”
Tap seven untapped artifacts you control: Draw three cards.

Whenever Daisite Express attacks, draw a card.
Whenever Daisite Express deals combat damage to a player, discard a card.

Serpentine Woods enters tapped.
{T}: Add {B} or {G}.
{2}{B}{G}, {T}, Sacrifice Serpentine Woods: Draw a card.

Transcend (Activate as a sorcery to gain the next type and a +1/+1 counter.)
When Dai Gui enters, create a 1/1 green and blue Bird creature token with flying and “{T}: Add one mana of any color.”
{X}{X}{G}{U}: Demigod — You gain X life and you draw X cards. X can't be 0.
{X}{X}{G}{U}: God — Put up to X creature cards from your hand onto the battlefield.

Flying
Whenever Phantasmal Owl attacks, it gets +1/+1 until end of turn for each other creature you control with flying.

Counter target spell. Draw a card, then discard a card.

Create a 1/1 white Human Samurai creature token, then create an additional one of those tokens for each card named Honor and Glory in your graveyard.

Target creature you control gets +2/+2 until end of turn.
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.”)

{T}: Add {C}.
Crew 1 (Tap any number of creatures you control with total power 1 or greater: This Vehicle becomes an artifact creature until end of turn.)

L.O.T.U.S. enters tapped.
When L.O.T.U.S. enters, conjure three cards named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)
{T}: Add three mana of any one color.

Haste
{W}: Fretport's Heedless gains lifelink until end of turn.
At the beginning of your end step, sacrifice Fretport's Heedless.