Guardian of Faith

Instant-speed phasing is white's most surgical protection spell, and this is a body that carries one on its back. Unlike a bounce or a sacrifice, phasing sends your creatures away and returns them exactly as they left: same tap state, auras still attached, counters intact, no re-entry triggers, nothing lost in translation. The flash grants the delivery window that makes the trigger matter, letting the phase-out fire at the top of an opponent's declare-attackers step or in response to a targeted removal spell, whisking the threatened permanents out of range for a full turn cycle. The honest cost of that safety is that the phased-out creatures cannot block on the way out and do not return until your next turn, so it rescues your permanents without stopping the swing itself unless the attack had nothing left to hit. That is the line this card walks: it is a protection spell, not a fog, and treating it as damage prevention will get you run over. What lifts it past a pure trick is the 3/2 with vigilance that stays behind after the phase resolves, holding the ground its own ability just cleared and attacking into it the following turn. The design packs a defensive answer and a proactive threat into three mana, which is why the reward comes from leaving it in hand and representing it rather than committing it to the board early.