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Ponder>index. Here's why: Ponder draws you a card, giving you card advantage, while Index does not. The drawing also allows you to draw answers to tough situations. For example: say you ran terminus and your opponent is all out attacking for game, with ponder you can reveal the top 3 find a terminus, draw it and miracle it since it will be the first card you've drawn for the turn. Index however in this case would just let you know what could have been.
Another important aspect about ponder is the choice to shuffle your library. This is extremely important if you need lands or answers but the top 3 cards of your library don't have one or the other, so you can just shuffle, and have an extra chance at finding what you need, or even getting rid of useless top deck cards like unneccesary lands. index does not allow you to shuffle, so if you have 5 useless cards on the top you are stuck with them.
the only real advantage index brings over ponder is the amount of cards you reveal, which is really irrelevant to what you'd want a scrying card to be doing in a delver deck. Which is creating card advantage or finding answers.
He was mistaken in that you cannot get in a miracle trigger using Ponder because Ponder isn't an instant speed spell. The only way to cast Ponder on your opponent's turn and trigger miracle would be to use card:Alchemist's Refuge, which won't help you in a delver deck.
Still mistaken Zesty lol. Snapcaster Mage can give a spell flashback for the turn, at instant speed. However, just because it was given flashback at instant speed doesn't mean it can be cast at instant speed. Just like card:Devil's Play, sorcery cards with flashback can still only be cast at sorcery speed from the graveyard.
How about this playtest the deck with all Index instead of Ponder , when you cast it ask yourself which one you wish that Index was, personally I believe Index to not be a good delver card simply because the card doesn't draw you anything and in the event you don't like the top 5 you're still stuck with them. Index seems more like a card slow playing 3+ color control would enjoy as they often can benefit from planning that far (control wants to drop a bomb reliably on optimal turns where as delver wants to keep the tempo up) and control will often be playing Evolving Wilds so they can get rid of a dead top deck.
To get it out at instant speed you could use card:Alchemist's Refuge along with Snapcaster Mage , but that play will require 8 mana and a land tap. Not to mention playing 3 awkward colors.
Your best bet is to just main phase your board wipes lol. The only reasonable way to instant speed board wipe in standard is to utilize Ponder and instant speed draw spells to miracle out a Terminus . (Miracle triggers bypass timing restrictions.)
Index allows you to see two more cards than ponder
Ponder lets you only see three cards, but: 1. Ponder replaces its self, allowing you to gain real advantage from the cards you got to see (which is extremely relevant when you're using it to find your lands). 2. Ponder allows you to shuffle away your cards if they aren't useful for you.