That way you have both states without having to choose
By combining Terra, Magical Adept with Yenna, Redtooth Regent, you can clog the skies with infinite 6/6 Fliers
If you gain an amount of life "for each" of something or "equal to the number" of something, that life is gained as one event and Heliod's ability triggers only once
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This makes players able to set up their discard pile significantly easier, which is why the card is often seen in Gardevoir ex decks
If you pair this with say Shard of Greed (which is included as one of the variant cards in Speed Duel Starter Deck: Destiny Masters ), on that final turn you will be able to search your Deck for 3 cards instead of drawing blindly from the Deck