Remind

Instant
Put the bottom card of your library into your hand.
Put Remind on the bottom of its owner's library.
Where did I put that again?Current version:
Remind 
Instant
Put the bottom card of your library into your hand.
Put Remind on the bottom of its owner's library.Where did I put that again?Designed as an anti-Hinder effect spell for EDH. Let's you still cantrip sortof with Energy Field out. Gets cards that Hinder themselves back to your hand, like the spell spoiled in the COMM deck: Spell Crumple. Two Reminds can loop (obviously, not in EDH)
Forethought

Instant
Put the top card of your library into your hand.
Put Forethought on the top of its owner's library.
Oh! There it is!Current version:
Forethought 
Instant
Put the top card of your library into your hand.
Put Forethought on the top of its owner's library.Oh! There it is!The opposite effect to Remind, which is weaker I believe since you'll just draw a Forethought the next turn (barring a shuffle effect). I suppose, as an instant, this guarantees a

CMC card for Counterbalance, though Sensei's Divining Top already does that and more. Again two of these would loop in formats where you can play more than one copy of a card. Note that you're not drawing a card, so looping isn't just

: All Lorescale Coatls you control get +1/+1 (does trigger Quirion Dryad, if that's relevant).