Giratina ex is played alongside Dragonite and Druddigon as a secondary attacker that can set itself up with Energy without the need of using up your attachment for the turn
The TL;DR is that: Urzas Saga will not be sacrificed as a result of Blood Moon type effects
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Its special summon from banish effect is great, as it becomes a 5000 ATK monster, and combined with Maliss in Underground , becomes 8000 to bring an opponent's life points to zero with just one attack
If you leave the game, any spells or permanents you control from Mindleecher are exiled, and any cards remaining in exile remain face down indefinitely
Elder Thing Effect / Level 2 / DARK / Fiend / 800 ATK / 1000 DEF Once per turn: during your Main Phase: Reveal 1 Ritual Spell in your hand to target 1 Level 9 or Level 11 monster on your side of the field: Change the target's Level to whatever you want until the end of the Main Phase