As an additional cost to cast this spell, sacrifice a green creature.Search your library for a green creature card, put it onto the battlefield, then shuffle.
: Exile target land card from a graveyard. Add one mana of any color., : Exile target instant or sorcery card from a graveyard. Each opponent loses 2 life., : Exile target creature card from a graveyard. You gain 2 life.
At the beginning of your draw step, you may draw two additional cards. If you do, choose two cards in your hand drawn this turn. For each of those cards, pay 4 life or put the card on top of your library.
+2: Look at the top card of target player's library. You may put that card on the bottom of that player's library.0: Draw three cards, then put two cards from your hand on top of your library in any order.−1: Return target creature to its owner's hand.−12: Exile all cards from target player's library, then that player shuffles their hand into their library.
: Look at the top three cards of your library, then put them back in any order.: Draw a card, then put Sensei's Divining Top on top of its owner's library.
+1: Target player draws two cards, then discards two cards.−2: Gain control of target artifact.−6: You get an emblem with "Whenever you cast a spell that targets one or more permanents, gain control of those permanents."
Imprint — When Isochron Scepter enters, you may exile an instant card with mana value 2 or less from your hand., : You may copy the exiled card. If you do, you may cast the copy without paying its mana cost.
Search your library for a green creature card with mana value X or less, put it onto the battlefield, then shuffle. Shuffle Green Sun's Zenith into its owner's library.