msem-instigator

Create three 0/1 green Plant creature tokens.

Whenever you play a land, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)
{1}{G}{U}{R}, Sacrifice three Clues: Exile cards from the top of your library until you exile three nonland cards. You may cast any number of those cards without paying their mana costs.

As long as a creature you control has flying, creatures you control have flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.

Whenever Sentry of Kollis Gate is dealt damage, put a +1/+1 counter on each other creature you control.

When Serafina's Gift enters the battlefield, if you cast it, target opponent gains control of it.
At the beginning of your upkeep, draw three cards, then discard two cards.

Deathtouch
{U/B}: Change a target of target spell or ability that targets Serafina to another creature you control.
Whenever Serafina deals damage to a player, at the beginning of the next end step, that player loses life equal to the life they lost this turn.

As an additional cost to cast this spell, discard a card or pay {4}.
Destroy target creature.

When Sift Through False Leads enters the battlefield, exile the top five cards of your library, then investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)
{2}, Sacrifice a Clue: Put a card exiled with Sift Through False Leads into your hand.

Creatures can't attack you unless their controller pays {2} for each of those creatures.
Whenever a permanent is returned to a player's hand, create a 1/1 white and blue Bird creature token with flying.

Flying
Tap two untapped creatures you control: Skymount Commander gains double strike until end of turn.

Flying
When Skymount Reinforcements enters the battlefield, put a +1/+1 counter on another target creature.

Trample

Whenever you tap a creature for mana, put a +1/+1 counter on that creature.
{T}: Add {G}.

Whenever Slaffield Workgate or another enchantment enters the battlefield under your control, create a 0/2 white Ox creature token.
{3}{W}: Return another target enchantment you control to its owner's hand.

Flash
Flying
Whenever you cast a spell during an opponent's turn, target permanent doesn't untap during its controller's next untap step.

Destroy each creature with power 3 or greater.

Each creature you control that has been dealt damage this turn by a source you controlled has indestructible.

Flying
When Sphinx of Ill Omens enters the battlefield, return target permanent to its owner's hand.
Discard a card: Target creature or player gains hexproof until end of turn.

Flying
Whenever another creature you control dies, creatures you control get +1/+1 until end of turn.

When Stonefall Golem leaves the battlefield, destroy target permanent.

Defender
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
{T}: Student of Lightning deals damage equal to its power to target player.

Target creature gets +3/+1 and gains trample until end of turn.

{T}: Put a +1/+1 counter on Tender of Gardens. Activate only as a sorcery.

Puzzlebox (Begin the game with this and another card you own from outside the game in the command zone, locked. That card is face down until you unlock this.)
{0}: Unlock Tesseract Conjecture. If the revealed card shares a mana value with three or more permanents you control, cast it without paying its mana cost.