Search your library for up to X basic land cards, where X is the number of different powers among creatures you control. Put those cards onto the battlefield tapped, then shuffle.
The Harvesttide dance is one of joyous abandon, a last revel before winter nights.
Flash When this Equipment enters, attach it to target creature you control. That creature gains hexproof and indestructible until end of turn. Equipped creature gets +2/+0 and has flying. Equip {3}{W}
Celestial Colonnade enters tapped. {T}: Add {W} or {U}. {3}{W}{U}: Until end of turn, Celestial Colonnade becomes a 4/4 white and blue Elemental creature with flying and vigilance. It's still a land.
Celestial Convergence enters with seven omen counters on it. At the beginning of your upkeep, remove an omen counter from Celestial Convergence. If there are no omen counters on Celestial Convergence, the player with the highest life total wins the game. If two or more players are tied for highest life total, the game is a draw.
Lands you control are Plains. Nonland permanents you control are white. The same is true for spells you control and nonland cards you own that aren't on the battlefield. You may spend white mana as though it were mana of any color. You may spend other mana only as though it were colorless mana.
Flying When Celestial Gatekeeper dies, exile it, then return up to two target Bird and/or Cleric permanent cards from your graveyard to the battlefield.
When Celestine Cave Witch enters, create two 1/1 black Insect creature tokens. Whenever Celestine Cave Witch attacks, you may sacrifice an Insect. When you do, curse defending player. (Create a black Aura Curse enchantment token that's attached to that player. It has enchant player and "At the beginning of your upkeep, you lose 1 life.")
Creatures without flying or islandwalk can't attack. Whenever chaos ensues, until a player planeswalks, you can't lose the game and your opponents can't win the game.
Flying, lifelink Healing Tears — At the beginning of your end step, return target creature card with mana value X or less from your graveyard to the battlefield, where X is the amount of life you gained this turn.
Hideaway 5 At the beginning of your upkeep, you may mill three cards. Then if there are twenty or more cards in your graveyard, you may play the exiled card without paying its mana cost.
{W}, {T}: Put a +1/+1 counter on target Soldier creature. Each creature you control with a +1/+1 counter on it can block an additional creature each combat.
"A well-trained force brings peace... which brings more time for training!"
Trample Centaur Vinecrasher enters with a number of +1/+1 counters on it equal to the number of land cards in all graveyards. Whenever a land card is put into a graveyard from anywhere, you may pay {G}{G}. If you do, return Centaur Vinecrasher from your graveyard to your hand.
When Centaur of Attention enters, roll five six-sided dice and store those results on it. At the beginning of combat on your turn, you may reroll any number of Centaur of Attention's stored results. Centaur of Attention gets +X/+X, where X is the greatest number of stored results on it of the same value.
When you unlock this door, search your library for a Room card that doesn't have the same name as a Room you control, reveal it, put it into your hand, then shuffle.