As long as Ultimate Tyranno is able to attack, it also means that no other monsters on the Field can, so the player's Field should be properly set up for it beforehand so they don't miss out on inflicting damage to their opponent's Life Points.
[W][W] Skull Bash: 20 damage
Card made through yugiohcardmaker.com YuGiOh Kazuki Takahashi Card Text Artwork Sorry for being so inactive, but this is my last year in college.....and summer means exams
Feast your eyes on a preview of his card as it will appear in Magic: The GatheringFinal Fantasy: sqex.link/MtGFF #MTGxFINALFANTASY Zenos' Magic: The GatheringFinal Fantasy card also has a borderless character version that can be found in any type of booster packs
If, hypothetically speaking, no characters in play were damaged at the time you began playing Emergency Aid, then it would have no potential to change the game state and it would immediately abort the process before the card is even played
Some cards, like Growth Spiral, may be obvious