There will be no way to tell which cards are yours at that point, so we will not be able to return the cards to you if you change your mind
Then you can exile a graveyard and gain a bunch of life, ramp out two lands of any type not just basics tapped, make a pair of 2/2 Bear tokens, or toss a pair of counters on all of your stuff for the going wide, and with the Bears as a default that's two 4/4s for six mana on a naked board
So, lets get stuck in
Creature - Human Assassin Vraska the Unseen +1: Until your next turn, whenever a creature deals combat damage to Vraska, destroy that creature
Actually, rarely is an understatementuntil recently, Id only made a second copy of a card once: A significant portion of the time I spend working on cards is just staring at the art and trying to figure out what to cut and how to piece it together
+1/+1 on just one creature seems ineffective