SURGE FOILCheapest priced copy (Fallout): $2.79 at Card Kingdom, near mint, their price list as of .
Idolized 
Enchantment — Aura · Rare · Fallout · #855
Enchant creature
Enchanted creature has "Whenever this creature attacks alone, it gets +X/+X until end of turn, where X is the number of nonland permanents you control."
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $2.79 to $34.99 at Card Kingdom
One ruling from Wizards of the Coast
- 8 March 2024A creature attacks alone if it’s the only creature declared as an attacker during the declare attackers step (including creatures controlled by your teammates, if applicable). For example, the ability granted by Idolized won’t trigger if you attack with multiple creatures and all but one of them are removed from combat. Similarly, creatures that enter the battlefield attacking later in combat won’t be considered when determining whether or not a creature attacked alone.