(Until your next turn, that creature can't attack or block and its activated abilities can't be activated.) If a card has no mana cost, its escape cost is an unpayable cost, so you can't cast it for that cost
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There are so many incredible Red cards in MTG as a whole, and Commander gets access to the vast majority of them
Lathliss gives you a 5/5 dragon token with flying whenever a nontoken Dragon enters under your control
Aside from that, it distributes mana to each player, and, as an unexpected receiver of said mana, it can be interesting to find ways to filter that mana into different mana sinks to avoid the inevitable mana burn
This means that spells that cost black mana can be paid for with two life for each black mana symbol in its cost