msem-instigator

Whenever Ensouled Thief attacks, upgrade it. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Prowess

{T}: Add {C}. Spend this mana only to cast an instant or sorcery spell.
Whenever you cast a glitched spell, scry 2.

Whenever you cast an instant or sorcery spell, upgrade Error Exploiter. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Flying
• Hexproof

Essence Manipulator enters with a +1/+1 counter on it.
At the beginning of combat on your turn, you may move a counter from target creature onto another target creature with the same controller.

Target player chooses a creature they control, then returns all other creatures they control to their owners' hands.

Glitch {U} (Remove one [restriction] for each time you pay the glitch cost.)
Counter target [noncreature] spell [unless its controller pays {2}].

{T}, Exile a card from your graveyard: Scry 1.

Glitch {2} (Remove one [restriction] for each time you pay the glitch cost.)
Tap up to two target creatures [with the same name]. Those creatures don't untap during their controller's next untap step.

Whenever Gifted Warmage attacks, upgrade it. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Flying

Glitch {2} (Remove one [restriction] for each time you pay the glitch cost.)
Draw two cards. [Then discard two cards.]

Glitch {2} (Remove one [restriction] for each time you pay the glitch cost.)
Return target creature [you control] to its owner's hand.
Draw a card.

Draw a card for each Avatar you control.

Glitch {2} (Remove one [restriction] for each time you pay the glitch cost.)
Put target creature [spell] on top of its owner's library.

Equipped creature gets +2/+1 and has flying.
Equip Wizard or Shaman {2}
Equip {4}

Flash
Ocean's Edge Kraken enters with a hexproof counter on it.
{6}{U}{U}, Remove a hexproof counter from Ocean's Edge Kraken: Return all other creatures to their owners' hands.

{3}{U}, Exile a card from your graveyard: Omen Serpent can't be blocked this turn.

Patient Optimizer gets +4/+4 as long as it has four or more kinds of counters on it.
Whenever you draw your second card each turn, upgrade Patient Optimizer. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Flying
• Hexproof
• Prowess

Untap target creature and upgrade it. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Flying
• Hexproof

Enchant creature
You choose whether enchanted creature attacks each combat rather than its controller (after its controller chooses which of their other creatures attack. That player still chooses the player or planeswalker it attacks.)

Look at the top six cards of your library. Put one of them into your hand and the rest into your graveyard.

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you attack, add a quest counter.
Scry 1.
Draw two cards.
​

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you cast a noncreature spell, add a quest counter.
Draw a card, then discard a card.
Return up to two target instant and/or sorcery cards from your graveyard to your hand.
​

Flying
When Soaring Skymage enters, mill four cards. You may return a creature card with flying from among the milled cards to your hand.

Flying
Other creatures you control with flying get +1/+1.

Put target nonland permanent into its owner's library second from the top.