Kaervek the Merciless [Time Spiral] Standardbrawl the player can activate mana

the player can activate mana abilities only if they're from lands that player controls and only if mana they produce is spent to activate other mana abilities of lands the player controls and/or to play that card

"To the tutors

you divide that creature's combat damage

Liu Bei's forces fought against Ma Chao at Chengdu

but it is true that these artifacts can be dangerous

Kaervek the Merciless [Time Spiral] Standardbrawl the player can activate manaSet: Time Spiral Type: Legendary Creature Human Shaman Rarity: Rare Cost: {5}{B}{R} Whenever an opponent casts a spell, Kaervek the Merciless deals damage equal to that spell's mana value to any target. "Rats and jackals feast in his swath, but even they will not walk with him." Mangara