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Lion Heart Rating: 4/10 Two mana to equip for +2/+1 is a fairly good deal, and the high casting cost is mitigated by the fact that its capable of killing a creature on entering

If you can put 2-3 creatures into play reliably its worth it, and it only gets better from there

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That said, if you do want to give your opponents free creatures, then this is a sweet way to downgrade their boards while furthering your goals