msem-instigator

Flying
When Sha Long enters, each player chooses an artifact they control, then sacrifices the rest. If they don't control an artifact, they may return an artifact card from their graveyard to the battlefield. Repeat this process for creatures, enchantments, and planeswalkers.

Deathtouch

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

Flying
When Rallywing enters, creatures you control get +1/+1 until end of turn.

Flying
When Inspirational Beacon enters, you gain 3 life.

Creatures with power 4 or greater can't attack or block unless their controller pays {2} for each of those creatures.

When Explorer's Torch enters, draw a card.
Equipped creature gets +1/+1.
Equip {1}

Creatures you control have menace.

{T}: Add {C}.
{2}, {T}, Sacrifice Lotus Barrens: Destroy target nonbasic land an opponent controls. You and that land's controller each create a colorless land token named Lotus Spring with “{T}: Add one mana of any color.”

Flying
Whenever Eta, Experimental Doctor attacks, you may exile target card from a graveyard. If a creature card was exiled this way, put a +1/+1 counter on Eta and you gain 2 life.

Disgraced 1 (This enters with a -1/-1 counter. Whenever it deals combat damage to a player, remove all -1/-1 counters from it.)
At the beginning of each player's upkeep, put a -1/-1 counter on target creature that player controls.

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

Draw four cards.
Metamorph {3}{U}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up and cast it at any time for its metamorph cost.)

Choose target creature you control. Exile each creature you control. For each creature exiled this way, create a token that's a copy of the chosen creature, except it has haste and isn't legendary. At the beginning of the next end step, sacrifice those tokens, then return the exiled cards to the battlefield tapped.

Lifelink
Whenever Infectious Ego enters or attacks, exile the top card of target opponent's library. If it's a land card, that player gets a poison counter. You may play that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell.

When Roseblood Hart enters, choose one —
• Destroy target artifact.
• Create a Treasure token.

Creatures your opponents control get -1/-1 until end of turn. (Then exile this card. You may cast the creature later from exile.)

Shimmer (Whenever this creature attacks, create a tapped and attacking token that's a copy of it. Exile the token at the beginning of the end step.)
Lha Elite's power is equal to the number of tokens you control.

Flying
Cycling {2} ({2}, Discard this card: Draw a card.)

Fleshcrawler gets +1/+0 for each player that has lost life this turn.

Reach (This creature can block creatures with flying.)
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Whenever one or more counters are put on a permanent you control for the first time each turn, create that many 1/1 green Squirrel creature tokens.
{1}{G}{W}, {T}: Proliferate. (Choose any number of permanents and/or players with counters on them, then give each another counter of each kind already there.)

Look at the top three cards of your library. Put one on top and the rest on the bottom in any order.
Draw two cards. You lose 2 life.

Enchant artifact
Enchanted artifact is a creature with base power and toughness 3/3 in addition to its other types.
Enchanted artifact has prowess and “Once each turn, when you cast a noncreature spell, you may untap this artifact.”

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