Meren of Clan Nel Toth [Secret Lair Drop Series] Dinosaur Avatar Then that player loses all

Then that player loses all unspent mana and you add the mana lost this way

Set: Antiquities Type: Land Rarity: Rare {T}: Add {C}

and the brightest thunder-bolt is elicited from the darkest storm

Set: Collectors' Edition Type: Enchantment Rarity: Rare Cost: {3}{R} Whenever a player taps a land for mana

Meren of Clan Nel Toth [Secret Lair Drop Series] Dinosaur Avatar Then that player loses allSet: Secret Lair Drop Series Type: Legendary Creature Human Shaman Rarity: Mythic Cost: {2}{B}{G} Whenever another creature you control dies, you get an experience counter. At the beginning of your end step, choose target creature card in your graveyard. If that card's mana value is less than or equal to the number of experience counters you have, return it to the battlefield. Otherwise, put it into your hand.