It's perfect
In order to make Hydras the best they can possibly be, you're going to need a lot of mana, and that's what Somberwald Sage and Rosheen are here to supply
(Choose any number of permanents and/or players, then give each another counter of each kind already there.) The copies of Radstorm created by its storm ability are put directly onto the stack
You can identify the rarity by the symbols at the bottom of the card, with Common cards featuring a gray circle and Enchanted cards bearing a multicolored hexagon
Finally the lands start getting way better, with better fixing like Drowned Catacomb, but also neat tech like Peat Bog + Saprazzan Skerry which are consistent ramp if we can proliferate and Diamond City that can store up tons of shield counters and then activate it reliably thanks to Venser creating creatures so easily
Its draw ability can be a little risky if you flip a big spell, so pairing it with cheap cards or scry tools like Opt helps to keep things safe