Once per turn: You can banish 1 "Elemental Dragon" Fusion monster in your Graveyard
As long as you arent plotting counterspells, though, this might be a nice way to get a card out of your hand for storm-style payoffs, to get the sweeper out on a turn when an opponent is tapped out, or to guard against discard spells
Going back to the early days of the game, White Knight cost two white mana to emphasize that it is a white knight
And since Kangaskhan is your most efficient attacker, requiring only 2 energies, you'll want to recycle that bad boy as much as possible
The Eeveelutions carry this set, with a few other SIRs like Roaring Moon and Ceruledge that have hefty price tags as well
As a general rule, Reverse Holos are not as rare as normal Holographic cards