Whenever Raph & Leo attack, if it's the first combat phase of the turn, untap one or two target attacking creatures. After this phase, there is an additional combat phase.
Raph & Leo turn your board into a two-swing engine: attack in the first combat, untap one or two attackers so they're ready to block or hit again, then take a bonus combat phase to double up your damage. You build a wide or tall aggressive board and convert each turn's attack into roughly double the value, closing games fast with combat triggers, extra attack steps, and pump.
Built-in extra combat every turn doubles attack triggers and damage for free
Untap clause keeps key attackers available to block or re-swing, smoothing tempo
Cheap RW commander curves out early and pressures the board immediately
Grants double strike to make the extra combat phases overwhelmingly lethal.
Add more extra-combat enablers (Aurelia, Moraug, Combat Celebrant, Aggravated Assault) and double-strike sources to maximize each attack step. Lean into evasion and anthem effects (Iroas, God of Victory; Dolmen Gate) so your attackers connect and survive, and include recursion like Sun Titan plus efficient RW removal to keep the board clear. Round out with ramp via Treasures and fast mana to deploy threats ahead of curve.