Look around you

I lost a game against Elves because I hadn't noticed Pendelhaven and had paid two life instead of three for Toxic Deluge and their Wirewood Symbiote lived and caused me the game.

So I need to pay attention to the board before I do things. I need to slow down. It happened again when I was playing Modern later in the day . Too fast. Not enough stopping to think things out.

I know this, but I keep doing it. I need to think of a way to remind myself to check things a bit more before making moves.

Now, what do I do, exactly?