Heart of Light

Legendary creatures you control get +2/+2.

This creature has protection from the colors of permanents you control.

Whenever you cast a Spirit or Arcane spell, you may put a ki counter on this creature. At the beginning of the end step, if there are two or more ki counters on this creature, you may flip it.

Exile all creatures.

Enchant Plains 2: Until end of turn, enchanted Plains becomes a 2/5 white Spirit creature with "Whenever this creature deals damage, its controller gains that much life." It's still a land. When enchanted Plains is put into a graveyard, you may return this card from your graveyard to your hand.

Whenever a player casts a spell, tap this creature.

Lands don't untap during their controllers' untap steps. At the beginning of each player's upkeep, that player untaps a land they control.

Target creature gets +1/+0 and gains first strike until end of turn. Splice onto Arcane—Tap an untapped white creature you control. (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)