The player may activate that card's forecast ability again during that upkeep.Hello readers! Today’s tip will be a short but simple one concerning Sylvan Library and what happens when you combine it with effects that replace drawing. If a player plays a card's forecast ability, then that card leaves that player's hand, then that card is returned to that player's hand, all during the same upkeep, the card is considered a new object.However, the forecast ability of any card in that player's hand may be activated a maximum of once during that upkeep. A player may activate the forecast ability of any number of cards during their upkeep.If that happens before the forecast ability resolves, it will resolve as normal.When a card that's been revealed to activate a forecast ability leaves its owner's hand, it stops being revealed.Unless the card that the forecast ability is on leaves its owner's hand, that card remains continuously revealed from the time the ability is announced until that upkeep step ends.Activating a forecast ability doesn't cause the card to leave its owner's hand.That player plays with that card revealed in their hand until it leaves the player’s hand or until a step or phase that isn’t an upkeep step begins, whichever comes first. The controller of the forecast ability reveals the card with that ability from their hand as the ability is activated. 702.57b A forecast ability may be activated only during the upkeep step of the card’s owner and only once each turn.702.57a A forecast ability is a special kind of activated ability that can be activated only from a player’s hand.From the Comprehensive Rules (June 16, 2023- The Lord of the Rings: Tales of Middle-earth)

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