The only downside is the big one that comes with any Cascade card, the randomness of the mechanic
A few of these have both options and you can choose based on your preference
It lacks protection and wont usually make an immediate impact on a game, but when this big mana commander survives a full turn cycle its likely to create an insurmountable advantage
Cantrips Modern cantrips arent quite Brainstorm in terms of power or skill required, but they are still cantrips
There are much cheaper alternatives, after all, if you're playing with a Green deck: you can have an Allosaurus Shepherd, Destiny Spinner, or Prowling Serpopard for half mana or less cost than Chimil
Sowing Mycospawn Sowing Mycospawn has a kicker cost that turns this one card into a two-land swing with a 3/3 fungus to show for it