Genghis Frog | Stridehangar Automaton

Cards

({U} magic symbol) and ({G} magic symbol) ({U} magic symbol) plus commander tax if applicable available.

Cast
Genghis Frog either from your hand or from the command zone by paying ({G} magic symbol) ({U} magic symbol) plus commander tax if applicable.
When
Genghis Frog enters, it triggers.
Holding priority, cast
Artificial Evolution by paying its mana cost, changing all instances of "Mutant" on
Genghis Frog to "Thopter".
Resolve the
Genghis Frog ability, creating a Mutagen token and a 1/1 Thopter artifact creature token due to
Stridehangar Automaton.
When the Thopter enters,
Genghis Frog triggers, creating a Mutagen token and a 1/1 Thopter artifact creature token due to
Stridehangar Automaton.
Repeat step 5.

Step 5 creates a mandatory infinite loop that will cause the game to end in a draw if it isn't interacted with.

This combo has been estimated to be Ruthless (Bracket 4+).