Guilds of Ravnica

Inescapable Blaze | Instant | | This spell can't be countered. Inescapable Blaze deals 6 damage to any target. | Steve Argyle

Justice Strike | Instant | | Target creature deals damage to itself equal to its power. | Clint Cearley

Integrity | Instant | | Target creature gets +2/+2 until end of turn. | Ben Maier

Invert // Invent | Instant // Instant | | Switch the power and toughness of each of up to two target creatures until end of turn. // Search your library for an instant card and/or a sorcery card, reveal them, put them into your hand, then shuffle. | Mathias Kollros