Doubles resources while creating attackers and blockers
Ariel, Treasure Collector
This just doesnt look worth it at all, so avoid at all costs
With Ariel we find many new things to celebrate
Kaalia of the Vast can cheat it from your hand (since it's a dragon), Yuna, Hope of Spira can bring it back from your graveyard (since it's an enchantment), and Esper Terra can copy it and trigger most of Bahamut's value by advancing three chapters: Summon: Bahamut isnt legendary, so Esper Terra has no problem copying it
(Im looking at you, Characteristic Defining Abilities.) The mechanic played a lot better than expected, especially with this years Magic mostly being played on Arena , which handled all the details of the mechanic for players