Pyromancer's Goggles | Expansion // Explosion

Cards

You have an additional instant or sorcery card in hand with mana value 4 or less.

({UR} magic symbol) plus enough mana to cast the additional instant or sorcery available.

Cast any instant or sorcery with mana value 4 or less by paying its mana cost.
Holding priority, activate
Pyromancer's Goggles by tapping it, adding ({R} magic symbol) .
Cast
Expansion by paying its mana cost, targeting the instant or sorcery cast in step 1.
Pyromancer's Goggles triggers, copying
Expansion, with the copy targeting the original
Expansion.
Resolve the copy of
Expansion, creating a copy of
Expansion targeting the original
Expansion.
Repeat step 5.