I like the idea behind these guys, but I sadly don't think either is very useful
Consider, for example, Hearthborn Battler, Zoraline, Cosmos Caller, and Pond Prophet
Performapals are the perfect deck to get used to Pendulum summoning they can swarm the field with a bunch of cute monsters, then act as a classic beat down deck from the good old days of Yu-Gi-Oh
These are both powerful enough to elevate the decks they fit into best (G/R Aggro and G/W Aggro)
Whenever you attack with them, you can search your library for an Enchantment with a mana value of three or less and put it into play
Each set has something specific you can look for to work your way through the revised MTG forensic ID flowchart to correctly identify just what youre looking at: The chart essentially goes through a checklist in order of border color, the date on the card (if any), and the language the card is in