Additionally, Dina has an activated ability that lets you sacrifice another creature to make you gain X life and put X +1/+1 counters on a target creature you control
If you choose two targets for Throw a Line, and one of the creatures is an illegal target as Throw a Line tries to resolve, the original distribution of counters still applies and the counter that would have been put on the illegal target are lost
This ability in itself puts Arcades head and shoulders above any other wall-tribal commander, as an Arcades player will never run out of cards to play, as each wall replaces itself in its owner's hand as soon as it's cast.
Since both players must reveal their hands from this effect, it's best to Set any Spells/Traps down first before using this card
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