When Aether Hub enters, you get {E} (an energy counter). {T}: Add {C}. {T}, Pay {E}: Add one mana of any color.
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.
Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.) Windbrisk Heights enters tapped. {T}: Add {W}. {W}, {T}: You may play the exiled card without paying its mana cost if you attacked with three or more creatures this turn.
Look at the top two cards of your library. Put one of them into your hand and the other on the bottom of your library.
Destroy all artifacts and enchantments. You gain 2 life for each permanent destroyed this way.
Target creature’s controller sacrifices it, then creates X 1/1 green and white Elf Warrior creature tokens, where X is that creature’s power.
Flying Wither (This deals damage to creatures in the form of -1/-1 counters.) Creatures your opponents control with counters on them can’t attack or block.
Whenever Slimefoot and Squee enters or attacks, create a 1/1 green Saproling creature token. {1}{B}{R}{G}, Sacrifice a Saproling: Return Slimefoot and Squee and up to one other target creature card from your graveyard to the battlefield. Activate only as a sorcery.
Each creature that’s enchanted by an Aura you control can’t attack you or planeswalkers you control. At the beginning of your end step, each opponent loses X life and you gain X life, where X is the number of Auras you control.
(Gain the next level as a sorcery to add its ability.) You have no maximum hand size. {2}{U}: Level 2 When this Class becomes level 2, draw two cards. {4}{U}: Level 3 Whenever you draw a card, put a +1/+1 counter on target creature you control.