the front side of Adaptive Training Post
the back of a classic MtG card
the front side of Insidious Will
the back of a classic MtG card

Color Identity: U

Initial Card State

  1.  
    Insidious Will
    Insidious Will
    in hand.
  2.  
    Adaptive Training Post
    Adaptive Training Post
    on the battlefield (with two or more charge counters on it).

Notable Prerequisites

  1. You have an instant or sorcery card in hand with enough mana to cast it.
  2. You have enough mana to cast
    Insidious Will
    Insidious Will
    .

Steps

  1. Cast the additional instant or sorcery by paying its mana cost.
  2. If
    Adaptive Training Post
    Adaptive Training Post
    had two charge counters on it, it triggers, putting a charge counter on it.
  3. Holding priority, activate
    Adaptive Training Post
    Adaptive Training Post
    by removing three charge counters from it, copying the next instant or sorcery spell you cast this turn.
  4. Cast
    Insidious Will
    Insidious Will
    by paying its mana cost, targeting the spell cast in step 1.
  5. Adaptive Training Post
    Adaptive Training Post
    triggers, copying
    Insidious Will
    Insidious Will
    , with the copy targeting the original
    Insidious Will
    Insidious Will
    .
  6. Resolve the copy of
    Insidious Will
    Insidious Will
    , copying the original
    Insidious Will
    Insidious Will
    , with the copy targeting the original
    Insidious Will
    Insidious Will
    .
  7. Repeat step 5.

Results

  1. Infinite magecraft triggers.

Metadata

  1. In 12 decks according to EDHREC.

Variants of this combo

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