After Knife and Death finishes resolving, they return from whence they came, to thine sideboard or collection
Selvala, Heart of the Wilds This three-drop mono-Green legendary Elf taps with a Green for mana equal to your highest-powered critter, so at least 2 with her counting her own 2/3 body
5B Surge Dont forget about this little mechanic out there called surge
Many decks make a habit, nay, an entire strategy out of returning their artifacts from the graveyard baiting out those removal spells just to return that Mycosynth Lattice to the field or cheat a Portal to Phyrexia into play with a Trash for Treasure
You probably wont want the proxy to be bigger than a card, because in this case, youll either be able to see the proxy through the card or have to be more precise at cutting the prints
Dinosaurs are here and in a big way