2/2 creatures are really easy to deal with and they dont do so well in combat, something which has gotten more prevalent in recent sets as 2/2s for 3 have become majorly outclassed by even the vanilla creatures in modern sets
Kain, Traitorous Dragoon by Toshitaka Matsuda
Most of the cards featured in Rovell's study follow a similar pattern
If its the high-value chase cards youre looking to pull, you can also buy them individually from TCGplayer including SIR Mega Greninja ex, Mega Hyper Rare Mega Greninja ex, SIR Cinccino ex, Mega Dragalage ex, and Mega Floette ex
You can also discard a card in order to make the Witch-King of Angmar indestructible while tapping it
Historically, this came about because Wizards R&D would use B for black and L for land, so U became the shorthand for blue and it's been that way ever since