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

Rally to Battle | Instant | | Creatures you control get +1/+3 until end of turn. Untap them. | Ben Wootten

Spirit of the Spires | Creature | Spirit | Flying Other creatures you control with flying get +0/+1. | Yeong-Hao Han

Sphinx of New Prahv | Creature | Sphinx | Flying, vigilance Spells your opponents cast that target Sphinx of New Prahv cost {2} more to cast. | Sara Winters

Basilica Bell-Haunt | Creature | Spirit | When Basilica Bell-Haunt enters the battlefield, each opponent discards a card and you gain 3 life. | Yeong-Hao Han