Especially since the printings of Ragavan, Nimble Pilferer and Dragons Rage Channeler, the steal a casting cost 1 nonland-permanent mode has become very important and overall buffed the playability of the card
Xyz Summon the second "Gustav Max" using "Bullet" and "Blue Traveler", then activate its effect to deal 2000 damage
Whenever you play a Floodborn character, if you used Shift to play them, each opponent chooses and discards a card
In other words, this can be the way in which you get your last 2 prize cards, and I have to say this wont be the first way that a Pokmon with the possibility of targeting the bench becomes very playable (anyone remembers the days of Cramorant V?)
We expect to have more information by the end of July, so stay tuned
However, proliferate can affect any number of permanents or players and it adds a counter of each kind already there! It naturally follows that a great proliferate deck would use as many different counters as possible