This is an ideal strategy to use against cards that otherwise would be ruinous to this deck like the dreaded Be Prepared
Some of the monsters you'll be able to collect are Greninja, Lapras, Drifloon, Zorua, Ho-Oh, Xerneas, Kyogre, Lunala, Zekrom, Zacian, Slowpoke (in a well!), Unown, and Meowth, among others
As for the mono-blue card, the design team decided they wanted to make it an Illithid, so they put the original art in slush and commissioned a new piece of art, the one now on Grazilaxx
Jadzi has Magecraft which cares about instants and sorceries that are both casted and copied by you
Thundertrap Trainer This kind of impulse draw on ETB is good on cards like Ingenious Smith, but Thundertrap Trainer is so flexible in terms of its targets and can offspring itself
(To amass Goblins X, that player puts X +1/+1 counters on an Army they control