The body isnt threatening, but the card selection makes it an excellent early play
"Hey, if it's anything like the Seto of my timeline..." "Alright, report!" "Oh, no." "What?" "Thomas Stanley utilizes the Toon field
C Common Dragon Mastery X SPELL Continuous Each monster you control that is equipped with a "Dragunity" monster(s) gains 500 ATK
This can kill weak blockers before combat even starts, but importantly, it doesn't make the flanker go from blocked to unblocked , so unless the flanker also has trample, the player the blockers were protecting is safe from combat damage
Beyond that, the boring staples: Smothering Tithe, Vampiric Tutor, Demonic Tutor, Animate Dead, blahblah
You can even use it for large HP EX cards to maintain health, but Oricorio is the best to use it on