Unfortunately, you can only activate Junk Tokens at Sorcery speed, but the chances of Impulse drawing a card you cant play on an opponents turn is more likely than on yours, so, aside from players trying to remove Junk Tokens and you being unable to respond, this probably is not the biggest issue
Subsequently, were implementing a one-card per-set rule to keep things interesting
After that the activated ability can start weaponizing your defenders, and shares similar space with a few defender commanders that turn toughness into your offense like Felothar the Steadfast, Doran, the Siege Tower, or Arcades, the Strategist
Easily the best Chandra payoff, however, is Chandra's Regulator, which lets you copy Chandras loyalty abilities
The first printed was Mentor as a three-mana 2/2 with one ability when a small dork with a two or fewer power arrives, you can swap a mana for a card