The set features many different types of cards from throughout the rich history of the Pokemon Trading Card Game including alternative reprints of Classic Pokemon Cards and examples of the many types of different mechanics/cards that the game has seen over the years including Champions Pokemon, EX, GX, V, VMAX, Delta Species and a whole lot more
If Mega Steelix EX attacks Mega Charizard Y EX first, it takes 250 20 20 = 210 DMG, surviving the monstrous onslaught
With NEO rotating, and continued demand, itll need reprinting eventually
You can Tribute 1 "Noble Knight" monster
I see it as a requirement to play one because if you are attempting to win with Serra Angel and there is a Maze of Ith (commonly restricted) in play, you need more ways to destroy it than a single Chaos Orb (although Stasis is another solution to Maze after the first activation)
(For a similar free-haste effect, see Xenagos, God of Revels)