Four flames mark the 2nd to last Spell Card like it in this set. The card's info says: BTTR-EN042: Mach 4 Continuous Spell Once per turn: You can target 1 Pony or 25th Pony-Type monster with 4000 ATK or DEF; its ATK becomes 6000, until the end of this turn, but halve your LP. (Common)