MtG Summoning Sickness Marker

We were playing this week, and thinking, that it would be nice to have some kind of marker to show what cards has summoning sickness. So I made this. And because someone else might want to use these too, here!  It was inspired by the old, 1997 pc game Magic: the Gathering by MicroProse. Yes, I'm that old, I actually played that game back then.