dragon mtg cards Eternal - Single Card target creature an opponent controls gets The Most Valuable Dragons In

Affinity may seem dull on a creature that costs 3 mana, but its great at reducing commander tax, and there's a heartwarming story there too (look it up)

But these things are still child's play compared to true packaging errors

Gallia of the Endless Dance gives you two cards if you discard one at random, which is a higher reward for the same level of risk as regular rummaging

Of course, you need additional land cards to make this effect worth it

To have three full Beta set collections

There's some great cards in here that will be useful in your Rise of the Floodborn collection, particularly the Merlin and Madam Mim cards, but otherwise this is the least competitive deck you can get.