If you control a tuner monster and a non-tuner monster, you can send them both to the graveyard to synchro summon a synchro monster that has a level equal to the combined levels of the two monsters used to summon it
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Tap three tokens to draw a card Tap four tokens to put three +1/+1 counters on Baylen and give him trample for the turn
Cards like Vilis, Broker of Blood and Sheoldred, the Apocalypse create a self-sustaining engine where paying life draws cards, which gains you life, letting you churn through your deck
Because of these changes though, sadly, they can also be somewhat unbalanced (further than the base game), and multiple people have been reporting bugs that can either cause major issues, or even break save files completely