TCG Playsim is a free, browser-based playtester for Magic: The Gathering. Play MTG online for free with up to four players in real-time multiplayer rooms. No download, no install, no account required to get started.
Build and play decks in Standard, Commander (EDH), Oathbreaker, Modern, Pioneer, Pauper, Legacy, and the shared-deck Dandân format. Each format is supported in the deckbuilder with appropriate validation.
If you are looking for a free MTG Arena alternative or a way to play MTGO in your browser without paying for digital cards, TCG Playsim is a manual playtester that runs in any modern browser. Every card from Scryfall is available — you don't grind a collection, you just build and play.
Commander (EDH) is fully supported with command-zone tracking, partner commanders, and 2-4 player free-for-all rooms. Oathbreaker decks track the planeswalker and signature spell separately.
TCG Playsim ships with several Dandân format variants ready to play. Both players draw from a single shared 60-card library — the format is built around the card Dandân and other island-walking creatures. Pick a variant in the deckbuilder.
More resources: Dandân format guide, Commander online, Oathbreaker online, Play Magic free in your browser, MTG playtester, MTG Arena alternatives.