Asriel Dreemurr fully heals you when you play him, making it a slightly different, all-class version of Kindness's Heal Delivery.
However, it comes with a much higher price, one of 18G, as it has 10/10 in stats just like Glyde.
You see this card in most decks, even some Kindness Decks, even though they have Heal Delivery. It's mostly used late game to make the most of this card's effect.
If you see your opponent saving money, they most likely want to summon this, as you need at least 2 turns to summon this under normal conditions (i.e. no cost drop or G gained through cards), because of the 10G cap.
Because of this, you can counter that by placing Mettaton EX.