msem-instigator

Flying
{1}, Sacrifice Gearcraft Observer: Look at target player's hand. Draw a card.

Hostile Habitat deals 2 damage to each creature.
Leitmotif (If you cast this spell from your hand, exile it as it resolves. When you next cast a spell that shares a color with this card, you may cast this from exile without paying its mana cost.)

Germinate, then creatures you control that are Saprolings or have counters on them gain indestructible until end of turn. (To germinate, put a +1/+1 counter on a creature or create a 1/1 green Saproling creature token.)

Harness (You may tap a creature you control as you cast this spell. If you do, reduce this spell's mana cost by that creature's power.)
Return target nonland permanent to its owner's hand. If this spell was harnessed, draw a card.

Creatures you control get +2/+1 until end of turn. Citizens and Peasants you control gain first strike until end of turn.

As an additional cost to cast this spell, discard a card.
Draw three cards.

When Inspired Blade enters, if you control another Warrior, draw a card.

Whenever a permanent you control leaves the battlefield, Second-Day Slayings deals 1 damage to each opponent.

Reach
{T}: Sadistic Sparkmage deals 1 damage to each opponent.

Whenever Wandering Doyen is dealt damage, it deals that much damage to you.
{4}{R}: Attacking creatures you control get +1/+0 and gain first strike until end of turn.

Return up to one target spell to its owner's hand.
Create two 1/1 blue Elemental creature tokens with flying. They can't block this turn.

When Student of the Scroll enters, scry 2.

When Posthumous Informant dies, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)

{1}{G}, {T}: You may put a creature or Revelation card from your hand onto the battlefield. Exile that permanent if it would leave the battlefield. If it's a Revelation, it enters as a Horror creature and you may cast a copy of it without paying its mana cost.

Other permanents you control have hexproof.
Prevent all damage that would be dealt to other permanents you control.

Search your library for an artifact card with mana value X, where X is 1 plus the greatest mana value among artifacts you control, reveal it, put it into your hand, then shuffle.
You may cast Tireless Endeavor from your graveyard by sacrificing an artifact in addition to paying its other costs.

Flying
Sacrifice Crystalcatcher: Counter target creature spell unless its controller pays {1}.

You may look at the top card of your library.
{T}: You may play the top card of your library.

Whenever Ivory Curtain Producer attacks, if it's enchanted or you cast a spell that targeted it this turn, create a 1/1 colorless Construct Actor creature token.

Flying, lifelink
Improve {1}{W/B} ({1}{W/B}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
Once each turn, when you gain life, you may have each opponent lose 2 life.

Choose any number —
• Counter target spell unless its controller pays {X}.
• Draw X cards, then discard a card.
• Create a tapped X/X blue Elemental creature token with flying.
Foretell {X}{U}{U} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

This spell costs {1} less to cast for each artifact you control.
Choose two —
• Untap each artifact you control.
• Put a +1/+1 counter on each artifact creature you control.
• Draw a card.

Spirited (When this enters, you may activate one of its activated abilities without paying its cost.)
{5}, {T}, Discard a card: Create a 0/0 colorless Construct artifact creature token with “This creature gets +1/+1 for each artifact you control.” It can't block this turn.

When Bone Pit Raptor enters, other creatures you control get +1/-1 until end of turn.
Revive {2}{R} ({2}{R}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)