Mass of Mysteries is a 5-color Elemental with First Strike, Vigilance, and Trample, and it can grant Myriad to another one of your elementals for a turn
Permanents that phase out with counters phase in with those counters
Now, the rosette pattern appears much more like distinct dots and overlaps black symbols and text (see the consistent black coloring of the mana symbol in the left image, vs
A rule in Limited Edition that prevented Walls from attacking was removed in 9th Edition and all walls were given the new keyword "Defender", which prevents them from attacking
Lesser powerful versions of this effect like Nighthowler and Wight of Precinct Six are also good, but since they only count creatures, they are usually much smaller than the Aberration
For 4 mana, you can search your opponent's most powerful/game-breaking spell and cast it against their will to either put you very far ahead in the game or straight-up win if it resolves