For example, if you control Johann, Apprentice Sorcerer (Once each turn, you may cast an instant or sorcery spell from the top of your library.) and Questing Druid is on top of your library, you can cast Seek the Beast, but not Questing Druid
Big Score requires you to discard a card, but it gives you two cards and two Treasure tokens
Partner (You can have two commanders if both have partner.) At the beginning of each of your postcombat main phases, you may pay X life, where X is the number of opponents that were dealt combat damage this turn
Legendary Creature - Elder Dragon Tombstone Stairwell Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) At the beginning of each upkeep, if this enchantment is on the battlefield, each player creates a 2/2 black Zombie creature token with haste named Tombspawn for each creature card in their graveyard
As the name suggests, these lands simply allow you to generate one of two colors of mana
While theyll come back eventually or sooner, with a disenchant they wont trigger ETBs, and importantly, you wont lose card advantage by destroying or exiling your own board in the process, as youll get your stuff back, too
