Dynaheir, Invoker Adept | Orthion, Hero of Lavabrink | Kelpie Guide

Cards

All permanents on the battlefield.
Orthion and
Kelpie Guide do not have summoning sickness.
You control a mana-producing permanent that can tap to produce at least ({R} magic symbol) .
({6} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) available.

Activate
Dynaheir by tapping it, copying the next non-mana ability you activate this turn that costs four or more mana.
Activate
Kelpie Guide's first ability by tapping it, untapping
Dynaheir.
Activate
Dynaheir by tapping it, copying the next non-mana ability you activate this turn that costs four or more mana.
Activate
Orthion's second ability by paying ({6} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) and tapping it, targeting
Kelpie Guide.
Dynaheir triggers twice, copying
Orthion's ability twice.
Resolve all
Orthion triggers, creating fifteen token copies of
Kelpie Guide with haste.
Activate a
Kelpie Guide's first ability by tapping it, untapping a permanent that can tap to produce at least ({R} magic symbol) .
Activate the mana-producing permanent by tapping it, adding at least ({R} magic symbol) .
Repeat from step 7 until you have at least ({6} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) available.
Activate two
Kelpie Guides' first abilities by tapping them, untapping
Dynaheir and
Orthion.
Repeat.
Once you have infinite
Kelpie Guide tokens, you can use them to get infinite mana, and then activate
Orthion targeting any other creature(s) you control.