Erode You randomly choose the specified number of cards from that opponent's hand and place them face up on the table in front of them. These cards are now Echoes. Echo An Echo is treated exactly as a card in your hand for all rules (including hand limit). It can be played or discarded normally. It's no longer an Echo once it leaves your hand for any reason (e.g., played into combat, discarded, boosted, or returned to the deck).