The Reliable Guardian

 This card is the DEF-boosting counterpart of Rush Recklessly.

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OCG Rulings

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When resolving the effect of "Blackwing - Silverwind the Ascendant", if a targeted monster has a higher DEF than the ATK of "Blackwing - Silverwind the Ascendant" - for example, if an effect like "Castle Walls" or "The Reliable Guardian" is Chained - the that targeted monster is not destroyed. If the effect of "Blackwing - Silverwind the Ascendant" targets two monsters and, at resolution, only one of the monsters has a higher DEF than the ATK of "Blackwing - Silverwind the Ascendant

Previously Official Rulings

Mentions in Other Rulings

Dawnbreak Gardna: If "Dawnbreak Gardna" gains DEF from "The Reliable Guardian", etc. and then is Normal Summoned again, the DEF increase is recalculated after applying its new original DEF.

Disc Fighter: When "Disc Fighter" attacks a face-down monster, after it is flipped face-up you can use "Micro Ray" to cause the DEF to go below 2000, and the monster will not be destroyed by "Disc Fighter"s effect. Or, you can use "The Reliable Guardian" to increase the DEF of a monster above 2000 so that it will be destroyed with "Disc Fighter"s effect.