Ravnica Allegiance

Angelic Exaltation | Enchantment | | Whenever a creature you control attacks alone, it gets +X/+X until end of turn, where X is the number of creatures you control. | John Severin Brassell

Sentinel's Mark | Enchantment | Aura | Flash Enchant creature Enchanted creature gets +1/+2 and has vigilance. Addendum — When Sentinel's Mark enters the battlefield, if you cast it during your main phase, enchanted creature gains lifelink until end of turn. | Zezhou Chen

Sky Tether | Enchantment | Aura | Enchant creature Enchanted creature has defender and loses flying. | Zezhou Chen

Smothering Tithe | Enchantment | | Whenever an opponent draws a card, that player may pay {2}. If the player doesn't, you create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.") | Mark Behm

Dovin's Acuity | Enchantment | | When Dovin's Acuity enters the battlefield, you gain 2 life and draw a card. Whenever you cast an instant spell during your main phase, you may return Dovin's Acuity to its owner's hand. | Bastien L. Deharme

High Alert | Enchantment | | Each creature you control assigns combat damage equal to its toughness rather than its power. Creatures you control can attack as though they didn't have defender. {2}{W}{U}: Untap target creature. | Daarken

Lawmage's Binding | Enchantment | Aura | Flash Enchant creature Enchanted creature can't attack or block, and its activated abilities can't be activated. | Mark Behm

Ethereal Absolution | Enchantment | | Creatures you control get +1/+1. Creatures your opponents control get -1/-1. {2}{W}{B}: Exile target card from an opponent's graveyard. If it was a creature card, you create a 1/1 white and black Spirit creature token with flying. | Eric Deschamps