While this card is equipped to a monster, that monster gains ATK and DEF equal to this card's ATK and DEF
Top chases include special art versions (SAR/UR) of Mega Dragonite, Mega Gengar, Mega Lucario, and the unique Stellar Pikachu
A retreat cost of only 1 colorless energy is also really good for a Pokemon of this strength, a x2 weakness to electric Pokemon may be troublesome but 130 hp will last awhile against those type of Pokemon especially if they aren't stage 2
The card is also an artifact enabling other potential synergies in the Tinker/Welder camp
While good on paper, it lacks the oomph and versatility to be a staple
In short, Soul Resonator is the key bridge here, since it tutors any Level 4 or lower Fiend when Normal or Special Summoned, a.k.a