Will definitely add to this soon
Merlin, Rabbit is the only card that allows you to draw, and while Tiana, Celebrating Princess does provide some benefit to an empty hand, the problem is that every card you draw of the top will cost less than four ink and be fairly low impact
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Investing so much mana into a token that can easily be bounced to death equates to too much risk
Of course, there are a few ways to speed up the process, like using proliferate or cards like Coretapper that allow you to add more counters to Darksteel Reactor
While you have to pay for the Pacts on the next upkeep or lose the game, there are several ways to circumvent this downside, and it can even be irrelevant if you win the turn you cast the Pact