Threnody Singer looks like a strange card for me to be maindecking a copy of, but Ive been really pleased with it as a sideboard card against Mono-Red and that matchup is so tough that I dont mind warping my deck a bit with it in mind
Arcanist's Owl Augury Owl Cat-Owl Dukhara Peafowl Francisco, Fowl Marauder Owl Familiar Owlbear Owlbear Cub Owlin Historian Owlin Shieldmage Owlin Spiralmancer Rimefeather Owl Ringwarden Owl Sage Owl Spire Owl Syr Cadian, Knight Owl Tempest Owl
So long as you keep foretelling cards and keeping your hand full so you can get that goad trigger, youll have yourself a hectic battlefield on your hands
There are always going to be slight variations in card size, because no printer is perfect
Honorary mentions: Poor Augur of Bolas I almost had it in the top 10 but, as is oft the case, it got relegated as being a pauper/cube giant pales compared to the importance of other formats
There are also a couple of cards that can be a bit of a problem if you arent used to attacking with other Pokemon that arent Dragonite