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Whenever you cast a creature spell with mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing 
has mana value 4. X counts as 0 except on the stack. 4 or greater, you draw a card, gain 1 life, and put a +1/+1 counter on Helga.
: Add X mana of any one color, where X is Helga's power. Spend this mana only to cast creature spells with mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing has mana value 4. X counts as 0 except on the stack. 4 or greater or creature spells with 
in their mana costs.
Hover an underlined rule to see what it means.
Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.
