There are four or more card types among cards in your graveyard.
Steps
At the beginning of your combat phase,
Helm of the Host triggers, creating a token copy of
Fear of Missing Out with haste.
When the
Fear of Missing Out token enters, its first ability triggers, causing you to rummage.
Declare the token
Fear of Missing Out as an attacker. It triggers, untapping another creature you control and causing you to get an additional combat phase after this one.
Repeat.
Results
Infinite draw triggers.
Infinite rummaging.
Infinite self-discard triggers.
Near-infinite ETB.
Near-infinite combat phases.
Near-infinite mana creatures you control can produce.