March of Burgeoning Life

As an additional cost to cast this spell, you may exile any number of green cards from your hand. This spell costs {2} less to cast for each card exiled this way.
Choose target creature with mana value less than X. Search your library for a creature card with the same name as that creature, put it onto the battlefield tapped, then shuffle.

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For example, say you wanted to choose a target with mana value 3. You need X to be at least 4. You could choose to cast March of Burgeoning Life by exiling two green cards from your hand and paying {G}, by exiling one green card and paying {2}{G}, or just by paying {4}{G}. If you had a reason to, you could even choose a greater value for X.

March of Burgeoning Life's target must have a mana value less than X. A creature with a mana value equal to X is not a legal target.

The mana value of March of Burgeoning Life while it's on the stack is the value chosen for X plus 1, no matter how much mana you actually paid to cast it.

You may exile more cards than necessary for March of Burgeoning Life's first ability, but you can't reduce the mana it costs to less than {G} this way.