His ability to ready up again twice per turn when chosen for an action or an item's ability seems fairly good to me as well, with a high ceiling for shenanigans, from my initial impressions at least
While Tidus has some interesting synergy with proliferate and card draw, its cost and abilities may not be strong enough to see widespread play in competitive environments
Namely that you have to deal combat damage to a player to activate the effect
At the beginning of each opponents upkeep, if that player has no cards in hand and this enchantment has two or more quest counters on it, you may have that player lose 5 life
Number Fifteen This just printed 2-drop 8/8 Dimir colored dork is next
Outside of those, its just a generic 5-mana tutor, nothing too special