how many land cards in a mtg deck Rin and Seri, Inseparable How many lands to include

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this allows them to evolve a non-Floodborn character into their new form, for a reduced cost to play the Floodborn card as a bonus

Ability costs can include ink (paid by exerting cards in your inkwell), exerted cards (paid by, well, exerting cards) or something else explained on the card itself

Individually these effects are marginal: but combined they form a card that was so good, many non-red blue base decks started playing red just to get it (plus Flametongue Kavu, to be perfectly fair)