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The Heart of the Cards allows Yugi to get the cards he needs to Summon Dark Magician and Dark Magician Girl at will, but you might want a card that guarantees you can Summon them when you need them too

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You may also wonder at the inclusion of Portal to Phyrexia, but there's a method to the madness

is the common effect of Horus monsters "While this card is in the Monster Zone, it can be activated when another card on your field leaves the field due to the opponent's effect." , and even if it receives an effect that targets it, it will lead to the activation of the monster's individual effect

If you play the card as a land first, the sorcery can not then be activated