Abilities that trigger whenever a creature attacks won't trigger, including the myriad ability of the tokens
It's awkward to read in hand, doesn't fit correctly on the stack, breaks a ton of visual effects that already exist, and is simply a case where the paper solution doesn't translate to digital ("just turn it sideways to read it" is fine for a card, but is not acceptable for someone's 49-inch ultrawide monitor, much less a smart phone)
I will say that quite a few different damage-doublers and life loss effects are floating around, all at varying converted mana costs, permanent types, etc
If you have Muk or Wheezing in your Active Spot in a match, you can play the Koga Trainer card
Illustrated by Daarken Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp