Notably, Dig Through Time also helped make sideboard cards extra-high-impact, if only because they showed up so much more often
There are many spells that can do the reanimation trick, but Recurring Nightmare is a cut above them all, as it is the only one that can lather, rinse, and repeat for as long as you have three mana and a creature on the battlefield and in the graveyard
If the card has any mandatory additional costs, such as that of Costly Plunder, those must be paid to cast the card
Myrel, Shield of Argive is currently the best options by a fairly wide margin
The added power of your cards combined and how much better they match up against your opponents is what makes up for that initial disparity and gives you a winning position from your early gambit
For now, few copies of Scythecat Cub are available, but theres a lot of interest in this new Landfall-supporting cat