Divine Conviction, which is a Support card I mentioned earlier, rewards the user with +0/+1 on all friendly creatures
Khorvath Brightflame + Sylvia Brightspear Khorvath Brightflame and Sylvia Brightspear are a dragon and a knight that give knight creatures flying and haste and give dragon creatures double strike, respectively
With those conditions met you put the untap spell on the stack, tap Stella to copy it targeting herself, let the copy resolve (untapping her), then use her ability again on the original spell to reset the loop
The format isn't shy about bombs, either, so be prepared for some swingy games
Also, it can make it challenging to use cards that target specific creatures
You've got the Guildmages, the Apprentices, the Maguses, the Battlemages, and more