At seven mana, it should be worth three and a half ThaliaThalias or Thorn of AmethystThorn of Amethysts, two Grand Arbiter AugustinGrand Arbiter Augustins, or two Dovin, Hand of ControlDovin, Hand of Controls, and it barely adds up to being better than one of any of them
You can't combo off playing a dozen spells, floating tons of mana, drawing a new hand and keep going
It's a Trap Raigeki (most of the time, your opponent's monsters won't have an A-Counter until your turn unless you have Kid or recently played PPV) and generates free counters on everything your opponent Summons, which is nice for turning Telepath into MST or even a sudden Brainwashing Beam, though Beam is kinda situational
SAR Pull Rates in Context SAR cards pull approximately 1 per 20-30 booster packs, which works out to roughly 2-4 SARs per 30-pack Japanese booster box on average
Tatsunari, Toad Rider Tatsunari, Toad Rider will punish all your opponents each time you cast an aura, which can help payoff triggered abilities that care about players losing life