Colossal Dreadmaw refers to a creature card from the Ixalan set of Magic the Gathering.
The card is often featured online as an exploitable meme, due to the superfluous nature of the card, compared to other cards.
The Ixalan set of Magic the Gathering was first released on September 29th, 2017.
It was here that the “Colossal Dreadmaw” card was introduced to the game, with a large redundancy in the card set.
Players quickly recognized the frequency of the card, relative to other creature cards, which led to the creation of numerous photoshop memes, revolving around the “Colossal Dreadmaw”.
These memes mostly circulate on forums boards and subreddits, related to Magic the Gathering, as well as Facebook, Twitter and Instagram.