My Laughter Echoes is a common Ongoing Scheme card from Archenemy: Nicol Bolas Schemes (OE01), collector number 12★. Current market price: $1.81, TCGplayer market prices via Scryfall.
(An ongoing scheme remains face up until it's abandoned.) Whenever you set a non-ongoing scheme in motion, you may abandon this scheme. If you do, set that scheme in motion again.