Searing Spear is another three damage spell for two mana
The average spellslinger deck should be able to get the disguise cost down to a single mana, making this the latest in a long line of similar creatures like Hearth Elemental and Bedlam Reveller
It's still a 3-card combo though so it's hardly oppressive
Loxi: I honestly wish the mayhem cost for this actually made it cheaper, but I can get how that would be a silly amount of stats
It doesn't copy whether that permanent is tapped or untapped, whether it has any counters on it or Auras attached to it, or any noncopy effects that have changed its power, toughness, types, color, and so on
The incremental increase from 4 to 5 Rats is a leap of 16 to 25 damage on board