If the target of an Aura spell is an illegal target as that spell tries to resolve, it wont resolve, it wont enter the battlefield, and none of its enters-the-battlefield triggered abilities will trigger
If this was helpful, but you want to brush up on the rest of the game read our in-depth guide to Disney Lorcana: How to Play
Scion of Draco Despite costing 12 mana, Scion of Draco can be cast for effectively 2 mana, thanks to triomes and Leyline of the Guildpact
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It pumps your creatures and brings one back to your hand each upkeep
Theres as much reliance on the luck of the draw as any TCG - the starter decks I played with didnt have too many abilities allowing players to draw extra cards, though there are definitely cards in The First Chapter with greater card draw effects - and it feels closely balanced to avoid players being steamrolled without good reason