Mocsar Bogwarden

When Mocsar Bogwarden enters the
battlefield, create two 1/1 Insect creature
tokens with "Whenever this creature deals
damage, you may gain life equal to the
number of Swamps on the battlefield".
"It's an eerie soul that rakes the muck, snatches
out anything crawling, and builds an army."
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Easter-Egg Challenge: Make a Colored Instant card with Converted mana cost 0.