If you think of this as a Frogmite where you have to pay 1UG to draw and play a random card from your deck it sounds a lot less value, more like a Think Twice
The cards are so rare that one PSA 9 was sold for a whopping $100,000
As the last mechanic introduced in the game, Konami learned from the mistake with Pends which were too experimental and convoluted and went with the next logical progression of Xyz, which have dominated the game uncontested for years, with Links Monsters while coming up with a creative method of keeping them balanced where in exchange for being by far the most efficient to summon monster in the game, they rely on Link Markers to be able to summon more than one monster
By swapping your opponent's reliable monsters off their board, and you setting an additional trap from your deck, you can be very sure that your opponent will not be making any sort of comeback that turn
In a Two-Headed Giant game, Rankle's second mode causes each team to lose 1 life twice