Like most Pokmon cards, the value of Aerodactyl-EX 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 (XY Black Star Promos)

Abuelo's Awakening Agadeem's Awakening Animist's Awakening Aurora Awakener Awaken the Ancient Awaken the Bear Awaken the Blood Avatar Awaken the Erstwhile Awaken the Honored Dead Awaken the Maelstrom Awaken the Sky Tyrant Awaken the Sleeper Awaken the Woods Awakened Amalgam Awakened Awareness Awakened Skyclave Awakener Druid Awakening Awakening Zone Awakening of Vitu-Ghazi Bright-Palm, Soul Awakener Chandra, Awakened Inferno Cyberdrive Awakener Ecstatic Awakener Edgar's Awakening Evil Reawakened Fearsome Awakening Funeral Room // Awakening Hall Funeral Room // Awakening Hall Helm of Awakening Isareth the Awakener Jace Reawakened Kumena's Awakening Kykar, Zephyr Awakener Lifecraft Awakening Malevolent Awakening My Undead Horde Awakens Phyrexian Awakening Rith, the Awakener Rith, the Awakener Avatar Rude Awakening Sylvan Awakening Thunderkin Awakener Valakut Awakening Volcanic Awakening Wildfire Awakener
is a pleasant return to story-based Yu-Gi-Oh
You cast the instant or sorcery while the ability is resolving and still on the stack
Some players dont like when a counter spell has the ability to counter it built in, but in my experience you either get the counter, or you screw up a turns mana unless the opponent had an overabundance of mana anyway