[scubbo]

Thankfully, printer ink (just about) remains cheaper than Magic cards.

[thaumasiotes]

You don't need printer ink. You can print them in grayscale, or cut some index cards to fit into sleeves and write the name of the card you want in pencil.

[yamazakiwi]

I use a bag of coins I've collected, each coin represents whatever card I need at the time.

[ranting-moth]

Just do it mentally and keep the game in your mind.

"I summon the Whoore Of Babylon, 70/30 flying. You're finished".