I don't know if it's a good idea to give an attack-boosted Obelisk that can be special summoned from the Extra deck a once per turn destruction effect, but the end result is always the same: a bad card
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A point to note is that the special summon triggers when they are "discarded," so they will not special summon if sent to the graveyard as a cost for Fateful Adventure or Forbidden Droplet
You can only use each of the following effects of "Kashtira Fenrir" once per turn
In essence, as long as you can tribute a fairy monster from your hand, Ultimateness can negate and destroy any effect, spell, trap and even special summon
Swift Gaia the Fierce Knight X DARK Level 7 [ Warrior / Effect ] ATK 2300 DEF 2100 If this is the only card in your hand, you can Normal Summon this card without Tributing