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One thing to note about both Ronintoadin and Substitoad is that neither card has any once per turn restrictions, letting you use them both as many times as you want

Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal U Legendary Artifact Spacecraft Whenever one or more charge counters are put on U Artifact Creature Elemental Flying When this creature enters, if you cast it, destroy all nonartifact creatures

All 242 cards have now been revealed

You'll definitely want to pick up either Flame Bufferlo or Lady Debug, alongside Parallel Exceed

So you can only activate one Monster Effect