msem-instigator

When Relearn History enters, draw two cards.
You have no maximum hand size.

Return Portal to the Unknown to its owner's hand: Add {U}{U}{U}. The next card you cast this turn can be cast as though it had flash.

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

Whenever an artifact or enchantment you control enters, target player mills two cards.

At the beginning of your upkeep, look at the top card of your library. If it's an artifact or enchantment card, you may reveal it and put it into your hand. Otherwise, you may put it on the bottom of your library.
If you would begin a combat phase, you may skip that phase and begin an additional upkeep step instead.

Search your library for up to six cards and exile them face down. Shuffle, then draw a card.

Target creature gets -4/-0 until end of turn.
Flashback {U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

{T}: Scry 1.
{1}{U}, {T}: Reveal the bottom card of your library. If it's an artifact or enchantment card, put it into your hand.

Put target creature with power X or less on top of its owner's library.
Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Return any number of target nonland permanents with different mana values to their owners' hands. If seven or more permanents were returned this way, you may cast spells without paying their mana costs until end of turn.

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}: If a player has fifteen or fewer cards in their library, unlock Dreamcast Relic. If the revealed card is blue, put it into your hand. Otherwise, put it on top of your library.

Choose one—
• Counter target spell.
• Exile two target permanents you control, then return them to the battlefield under your control.

When Demonqueller Mage enters, gain control of target creature with power 2 or less until Demonqueller Mage leaves the battlefield.

Counter target spell with mana value 3 or less. If a spell is countered this way, return it to its owner's hand instead of putting it anywhere else.

{1}, Exile Coiling Mystic from your graveyard: Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
At the beginning of your end step, you may untap another target permanent.

Target creature gets +2/+2 and gains lifelink until end of turn.

If Wandering Domovoi would be dealt noncombat damage, prevent that damage and put three +1/+1 counters on Wandering Domovoi instead.

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.

Destroy each creature with power 3 or greater.

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

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

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

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.

When Realmwalker Domovoi enters, exile another target permanent you control. Return it to the battlefield under your control at the beginning of the next end step.