I've seen people suggest Doppelgang and Worldsoul's Rage, and both could end up being the right choice, but I would prefer to be able to cast the spell I want off of Radiant Lotus immediately after playing it, and these both require a second color of mana
Special Summon that target in Attack Position, also, for the rest of this turn after this card resolves, you cannot activate monster effects, except the effects of that Special Summoned monster on the field
Shaddoll Dragon, Twin Twisters, and Red Reboot are also good options when facing backrow decks
this deck also has favorable matchups against almost every other meta-relevant deck with just the Black Moria deck being the exception
The Shaddoll Fusion that was retrieved earlier on could be used as discard fodder for the activation of a Knightmare Link Monsters effect
The Six Samurai return