Mill an important creature to the rad counter
In Armageddons case, cards outside of lands ramp you, like Smothering Tithe or mana rocks
However, since you don't know how many energy card your opponent has, sometimes this card might not be useful, but its still worth trying to use it to put your opponent in a difficult situation
Heres the practical workflow most collectors use: take a photo of your Japanese card, note the set symbol and collector number (bottom-right corner), then search for that card online
At casual tables, the best number to choose is probably 2 or 3, but dont be surprised if everyone else at the table hates you for it
Creatures you control that become Elves later in the turn won't get the bonuses, and Elves you control that got the bonuses that stop being Elves later in the turn won't lose them