Jain's Chains

When Jain's Chains transforms return a creature
card with a chain-link counter from exile to the battlefield and attach Jain's Chains to it.
Enchanted creature gets +1/+0 and gains "Whenever
this creature deals combat damage to a player you
may exile a card from a graveyard, if it was a
creature, put a chain-link counter on it.
Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)