One path would be to lean heavier into artifact synergies, as the precon is already doing a little through Nettlecyst
On the other hand, there are some non-Niv decks in older formats that could probably use Jegantha, the Wellspring, the question is whether starting with a random 5/5 for five in hand is the best use of a sideboard slot
If you disregard the channel ability, it is an O-ring for two common card types
While not particularly dangerous to foes with a lot of HP, unevolved Pokemon and those resistant to regular damage from fire attacks can be weakened or knocked out passively from a Burn, making it a useful secondary strategy
There are Secret Lair drops that introduce eye-catching anime versions of existing Magic cards
Leah[] Danny activates Engage for Raye, then goes for Kagari to add Engage back, then makes Shizuku and Sets 2, then adds Multirole