For opponents, one could force them to draw on a full hand, meaning they'd have to discard all three cards
Conclusion While I don't think Restoration Magic is a staple, the combination of low cost and flexibility makes it an appealing option for decks that really care heavily about keeping a specific permanent in play
That means 1 or 0 base, which is a lot of things naturally like Esper Sentinel, Mother of Runes, Birds of Paradise, Essence Warden, Blood Artist, you get it
Pushing the impactful cards to higher rarities helps make the games more even-keeled in Limited because of card as-fans (the rate at which a certain card or subset of cards show up within an average booster pack) and in casual Constructed because of card availability
Carnelian deals a huge 280 damage, more than enough to take down most threats, though it comes with the drawback of preventing Flareon from attacking the next turn