Roar of Jukai

two generic mana one green mana Instant — Arcane

If you control a Forest, each blocked creature gets +2/+2 until end of turn.

Splice onto Arcane—An opponent gains 5 life. (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)

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8 printings

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Roar of Jukai rulings

2013-06-07
You reveal all cards you intend to splice at the same time. Each individual card can be spliced only once onto any one spell.
2013-06-07
A card with a splice ability can’t be spliced onto itself because the spell is on the stack (and not in your hand) when you reveal the cards you want to splice onto it.
2013-06-07
You choose all targets for the spell after revealing cards you want to splice, including any targets required by the text of any of those cards. You may choose a different target for each instance of the word “target” on the resulting spell.
2013-06-07
If all of the spell’s targets are illegal when the spell tries to resolve, it won’t resolve and none of its effects will happen.
2005-02-01
Roar of Jukai can be cast even if you don’t control a Forest or there are no blocked creatures. If you control no Forests or if there are no blocked creatures, the spell does nothing.

Roar of Jukai keyword rules

Splice Rule 702.47

Splice is a static ability that functions while a card is in your hand. “Splice onto [quality] [cost]” means “You may reveal this card from your hand as you cast a [quality] spell. If you do, that spell gains the text of this card’s rules text and you pay [cost] as an additional cost to cast that spell.” Paying a card’s splice cost follows the rules for paying additional costs in rules and –h.

You can’t choose to use a splice ability if you can’t make the required choices (targets, etc.) for that card’s rules text. You can’t splice any one card onto the same spell more than once. If you’re splicing more than one card onto a spell, reveal them all at once and choose the order in which their effects will happen. The effects of the main spell must happen first.

The spell has the characteristics of the main spell, plus the rules text of each of the spliced cards. This is a text-changing effect (see rule , “Text-Changing Effects”). The spell doesn’t gain any other characteristics (name, mana cost, color, supertypes, card types, subtypes, etc.) of the spliced cards. Text gained by the spell that refers to a card by name refers to the spell on the stack, not the card from which the text was copied.

Choose targets for the added text normally (see rule ). Note that a spell with one or more targets won’t resolve if all of its targets are illegal on resolution.

The spell loses any splice changes once it leaves the stack for any reason.