They have never had a phenomenal attacker to work with against Greninja as all of their options are mediocre at best, and this proved to be the case during the matchup here
You can use creature tokens to help you cast convoke or improvise spells, populate abilities need tokens to function, and you must explicitly sacrifice a token to fulfill the requirement for a bargain spell
Physical TCG products that go out of stock before release tend to hold secondary market value, which drives even more pre-launch buying
You can tap any untapped creature you control, including one you haven't controlled continuously since the beginning of your most recent turn, to pay the cost of the first ability
On a few creatures, abilities that wouldn't make much sense to have another creature gain until end of turn, such as flash or landcycling, are printed above backup