You can banish 1 face-up "Elemagus" monster in your Extra Deck, and if you do, target 1 face-up card your opponent controls
Though I often find success naming 2 or 3, it can be useful to name a number appearing on opposing commanders to benefit from your opponents desire to keep them in play
However, fans can get ahold of these reprint sets that pay homage to the prize winners decks which are the next best things
Rather, a second "reflexive" ability triggers when you forage this way
This causes the Day of the Dragons to leave the battlefield since its a creature, which then sacrifices all dragons you control and returns the exiled cards (notably Opalescence and Day of the Dragons) back to the battlefield
It remains to be seen if the TCG can succeed once the initial hype dies down, but with a good game balanced on rock solid IP, it has every reason to.