Reverent Mantra

You may exile a white card from your hand rather than pay this spell's mana cost.
Choose a color. All creatures gain protection from the chosen color until end of turn.

Samite Blessing

Enchant creature
Enchanted creature has "{T}: The next time a source of your choice would deal damage to target creature this turn, prevent that damage."

Atalya, Samite Master

{X}, {T}: Choose one —
• Prevent the next X damage that would be dealt to target creature this turn. Spend only white mana on X.
• You gain X life. Spend only white mana on X.

Crackdown

Nonwhite creatures with power 3 or greater don't untap during their controllers' untap steps.

Orim, Samite Healer

{T}: Prevent the next 3 damage that would be dealt to any target this turn.

Angelic Renewal

Whenever a creature is put into your graveyard from the battlefield, you may sacrifice this enchantment. If you do, return that card to the battlefield.