If you aren't allowed to take an action, it doesn't matter how hard you try
If you gain an amount of life "for each" of something or "equal to the number" of something, that life is gained as one event and Leyline of Hope's second ability applies only once
For two mana you can morph it into a land that taps to add one colorless mana
Meaning if you run more than one of these, you could fill up quickly and not be able to set or play other better cards
If you play an Emeria, Shattered Skyclave early on in the game, you can't then decide you want to cast its other side, Emeria's Call
Instead, she's a specialist in the move Sunny Day, as her lead Pokemon has the ability Drought and all of her team benefits from the forced weather: Ninetales Lilligant Shiftry Chandelure Flying-type moves aren't a bad call, nor are Fairy