Gem-Knight Seraphinite (HA07-EN058) [Hidden Arsenal 7: Knight of Stars]

1 "Gem-Knight" monster + 1 LIGHT monster // Must first be Fusion Summoned with the above Fusion Material Monsters. During your Main Phase, you can Normal Summon/Set 1 monster in addition to your Normal Summon/Set. (You can only gain this effect once per turn.)