Arcane Bombardment + Strionic Resonator

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Overview

Strionic Resonator can copy Arcane Bombardment’s triggered ability on the stack, creating an additional triggered ability that will resolve separately; each instance exiles a random instant or sorcery from your graveyard when it resolves and then copies every card currently exiled with Arcane Bombardment and (per the text) casts those copies without paying their mana costs [2018-03-16] [706.10] [706.12].

The StackRules & CitationsDetails & Edge Cases

Step 1

You cast your first instant or sorcery this turn; Arcane Bombardment’s triggered ability is put on the stack (it is a triggered ability because it uses "whenever").

Step 2

While that triggered ability is on the stack you may activate Strionic Resonator, targeting that triggered ability; Strionic’s activation puts a copy of the targeted triggered ability onto the stack above the original [2018-03-16] [706.10].

Step 3

Resolve the topmost instance (the Strionic-created copy) first; when it resolves it exiles a random instant or sorcery from your graveyard and then copies each card currently exiled with Arcane Bombardment and casts those copies without paying their mana costs [706.10] [706.12].

Step 4

After the copy resolves, the original Arcane Bombardment triggered ability will later resolve; when it resolves it also exiles a random instant or sorcery from your graveyard and then copies each card currently exiled with Arcane Bombardment (which now may include the card the copy exiled), then casts those copies without paying their mana costs [706.10] [706.12].

Step 5

Because the random-exile step happens on resolution, each resolving instance of the ability chooses (at random) an instant or sorcery from your graveyard independently; choices made on resolution are not copied by Strionic [706.10].

Step 6

Each copy of an exiled card that is created by the ability is then cast as a spell while the ability is resolving, following casting rules for copies [706.12]; if such a cast copy has in its cost and is being cast without paying its mana cost, X is 0 [2022-04-29].

Resolution

You may activate Strionic Resonator to target the Arcane Bombardment trigger after it’s on the stack; Strionic puts a copy of that triggered ability onto the stack [2018-03-16] [706.10]. Each instance (the copy and the original) resolves separately. When an instance resolves it performs its steps: exile a random instant or sorcery from your graveyard, then copy each card exiled with Arcane Bombardment and cast any number of those copies without paying their mana costs [706.10] [706.12]. Because the random exile happens on resolution, each resolving instance picks its own card(s) independently (choices made on resolution are not copied) [706.10]. If a copy is cast without paying its mana cost and it has in its cost, choose X = 0 [2022-04-29].