When paired with consistent graveyard recursion cards found in Commander decks built around creatures like Meren of Clan Nel Toth, Spore Frog can allow its controller to essentially prevent damage that would be dealt to them every turn , keeping them alive long enough to enact whatever shenanigans they have in mind
Looks like the TCG median of Grave-Troll from the duel deck is around $5
It keeps its abilities and types.) You may have this creature enter as a copy of an artifact or creature you control, except its an artifact creature in addition to its other types, and its power and toughness are equal to this creatures power and toughness
It could be an excellent blue commander for a storm deck or just general spellslinger value by discounting cards like Nexus of Fate and Mnemonic Deluge
Keep it on the battlefield long enough, and you'll get some decent value-for-mana
Hopefully one or more of these options gives you a few ideas for your own Jumbo Cactuar deck