These cards dramatically warp commander games, whether having players run away with resources, shift in ways many players dislike, cause people to not be able to play the game, really efficiently search for their strongest cards, or commanders that tend to be only built in ways that take away from more casual games
Once you've announced that you're casting a spell, players can't take any actions until you've finished doing so
If a spell has multiple targets, you can't target it with Hydroelectric Specimen's ability, even if only one of those targets is a creature or all but one of those targets have become illegal
Lotus Field is usually paired with cards like Stifle or Tale's End to circumvent the drawback, and you can untap it with Hidden Strings
There are two distinct sets on offer from the Disney Lorcana TCG, and they're available at different times
My verdict: A great option for serious collectors, simple, customizable, and big enough