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It was originally created as a means to keep people busy while they wait in line for gaming conventions

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When any typed creature enters, if its power is 4 or greater, you can pay mana to have Slinza fight another creature you dont control, acting as a form of removal

This engine piles on value by generating blue and red mana equal to its power once each turn, then it scales bigger with +1/+1 counters whenever you cast noncreature spells

Legality depends on the tournament format -- Cloud, Planet's Champion can be legal in some formats and banned or restricted in others