These cards all interact, to additionally multiply token production from 2x to 4x and beyond, so critical mass is a good way to end the game in combination with your drain effects
Otherwise, buying cards standalone is perfectly legit as well, especially for some of the less pricey picks from the latest Universes Beyond set
. Each time an event puts one or more permanents onto the battlefield, all permanents on the battlefield (including the newcomers) are checked for any enters-the-battlefield triggers that match the event
Its a really concise engine
Its game plan centers on counter-based interaction, punishing opponents whenever counters are placed while it rewards its controller with card advantage or life drain
This is just a brief list of some of the slang youll hear in Magic, but it should help you get a grasp of what people are talking about