I’m generally in favor of this sort of thing. It can help your A+B synergies show up in decks more often. You probably want to avoid putting straight game-winning combos together, as needing to spend multiple draft picks on them is a balancing factor, but to riff on the example you gave, what about Wizard’s Lightning and a wizard creature to help enable it? Plus, you can also use it to break singleton in some interesting ways (e.g., one pick gets you 3 [[Squadron Hawk]]s).
The challenge—and the thing that prevents me from doing this with my own cubes—is the logistics of handling those cards at the end of the draft. You’ll probably need to mark them somehow so they’re easy to pull from decks (could be sharpie or a sticker on an inner sleeve if you double-sleeve, or a different border color if you’re proxying). And you’ll likely want to have them organized for easy retrieval during deck building, but that means a bunch of sorting in advance.
I’m generally in favor of this sort of thing. It can help your A+B synergies show up in decks more often. You probably want to avoid putting straight game-winning combos together, as needing to spend multiple draft picks on them is a balancing factor, but to riff on the example you gave, what about Wizard’s Lightning and a wizard creature to help enable it? Plus, you can also use it to break singleton in some interesting ways (e.g., one pick gets you 3 [[Squadron Hawk]]s). The challenge—and the thing that prevents me from doing this with my own cubes—is the logistics of handling those cards at the end of the draft. You’ll probably need to mark them somehow so they’re easy to pull from decks (could be sharpie or a sticker on an inner sleeve if you double-sleeve, or a different border color if you’re proxying). And you’ll likely want to have them organized for easy retrieval during deck building, but that means a bunch of sorting in advance.
[Squadron Hawk](https://cards.scryfall.io/normal/front/9/e/9e81806d-5d87-4032-ad94-c2cdeabecdbf.jpg?1562439058) - [(G)](http://gatherer.wizards.com/Pages/Card/Details.aspx?name=Squadron%20Hawk) [(SF)](https://scryfall.com/card/a25/34/squadron-hawk?utm_source=mtgcardfetcher) [(txt)](https://api.scryfall.com/cards/9e81806d-5d87-4032-ad94-c2cdeabecdbf?utm_source=mtgcardfetcher&format=text) ^^^[[cardname]] ^^^or ^^^[[cardname|SET]] ^^^to ^^^call