Like most Pokmon cards, the value of Gimmighoul depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Surging Sparks)
Protects your cards from scratches, dust and wear A great way to show off your Yu-Gi-Oh fandom
I would not play it over Trumpet Blast if your strategy is aggressive, but if you don't have access to Trumpet Blast, it's a fine substitution
Predicting whats going to see the most play throughout that many months of different formats is basically impossible, but thats the fun of this
1Abzan Falconer
If you think about it, it has the disadvantage of being unable to attack, and the effect is unstable, so it's quite a difficult monster