With infinite mana, you can use the same strategy you used to recur Lotus Petal to loop Finale of Devastation into a hasty Deathrite Shaman, which you can activate an endless amount of times to drain opponents out of all their life
Another possible combo is with Capsize, following the same Buyback logic as Searing Touch, but this costs 1 generic and 2 Blue with Buyback 3, so it can only return a handful of permanents to their owners' hands
A creature with Protection from a quality, let's say a colour for simplicity, can't be targeted by spells and abilities of that colour (like Shroud, that's regardless of who controls them)
Jozu helps shift the field presence in your favor, and if you use a cost-reduction card, you can remove a high-cost carry from play, putting your opponent behind on the field
Ashaya will usually be a big creature, so cards that scale based on power and toughness are excellent