This creature's controller and that player each draw half that many cards, rounded down." Preventing player damage (or damage to your MTG Commander) is a pretty powerful play, especially when the only cost is allowing you and your opponent to both draw cards
Infinite_Sandwich895 noted that they felt a bit ripped off after buying a Bundle, and others in the comments echoed this sentiment
Additionally, pairing it with Reshiram allows you to get loads of Energy in play very quickly
Trainer Cards Play Trainer cards (as many as you want, but only one Supporter card and one Stadium card per turn)
Your opponents are then forced to choose between taking more poison counters or losing their creatures
Even though Im not sure being a tapper is all that relevant in a game of Commander, you do get a Clue token when you do it, so its always going to be useful