Sometimes its the rarity, sometimes its the conditionbut often, it comes down to who illustrated the card
If deck-building allows it, try to put a companion in there too
However, it does come with the caveat that you need to control a creature with power four or greater in order to receive this benefit
In FFVII, Tifa is who convinces Cloud to join AVALANCHE, the group that opposes the game's bad guy, Sephiroth (Sephiroth and Cloud will also face each other in the Starter decks, which have been fully leaked)
Professor Elm's Training Method is a card that made evolution decks ten times more playable in the eras it was legal by having the simple yet useful effect of allowing you to search your deck for an evolution Pokemon
destroy both that card and this card