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Finally, the real kicker is the type - Water - and not only that, the fact that it's not limited to Water-type Pokmon, like Erika is with Grass, but any Pokmon with a Water-type energy attached

I don't know link monsters well enough yet to know what can be used but there is room to shorten your Extra deck, I'd suggest keeping 2 Gungnir though since he is the easiest to summon, with the best effect.

As far as actually using Tangrowth Lv

Toxic Deluge This is one of the new-to-Modern cards that, thanks to being reprint in MH3, are now Modern-legal

Such is the case with the recent VSTAR cards beginning with the Pokemon Sword and Shield and Sword Shield Brilliant Stars sets