Shoutout to Brotherhoods End, too if for whatever reason youre not big on rocks or small creatures, this one can pull a lot of weight, too
When challenging other players the game actually uses a variety of factors to match you up with someone of a similar experience level -- so newcomers don't have to worry about getting humiliated by a TCG expert when they're just learning the ropes
That said, Call for Backup only has three reprints worth $2+, including the big-ticket Kalonian Hydra, with Strionic Resonator and Flameshadow Conjuring both just over $2
However, you do get to see all the results before deciding whether to use it, and if so, which result to shift
Its worth mentioning Scheming Fence enters as, meaning its not a triggered ability, so people cant sacrifice/destroy/exile the permanent youre choosing, just like with Spark Double
This is exemplified by the expansions mascot Charizard ex, a Tera Pokmon ex which is Darkness-type as opposed to Fire (thereby evoking imagery reflected in the sets name)