one is an occasionally very powerful answer, the other is a always very efficient answer
By putting shield counters on up to three creatures, it gives them multiple layers of defense against both removal and combat damage
Most lists combine Artist's Talent and Monument to Endurance to create an almost inexhaustible stream of value, while Stormchaser's Talent has been cut from the majority of Izzet Lessons builds
If the creature with mentor leaves the battlefield with mentor on the stack, use its power as that creature last existed on the battlefield to determine whether the target creature has less power
Still, Melira will start to get prohibitively expensive as the game goes on if youre regularly exiling it
Additionally, its start your engines ability promotes aggressive strategies, eventually making artifact spells easier to cast at max speed