Abilities that trigger whenever a creature attacks won't trigger, including the myriad ability of the tokens
If you have Muk or Wheezing in your Active Spot in a match, you can play the Koga Trainer card
In a dedicated shell copying spells, however, The Twelfth Doctor gets big rather quickly, turning it into a possible win condition
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)
Unlike many effects that grant additional combat phases, you don't get an additional main phase with Godo, Bandit Warlord's ability