what are battle cards mtg Battles Choosing Your Battles, Part 1

For example, if a card exiled with Norin's last ability is a creature card without flash, you may cast that creature spell only during your main phase while the stack is empty

#10 Mana Vault - Golden Age I'm confused, but for this amount of mana it's worth it

Cycling ( , Discard this card: Draw a card.) Cid, Timeless Artificer Rarity: Uncommon TYPE: Legendary Creature SUBTYPE: Human Artificer CMC: 4 Mana cost: USD: $4.36 EUR: 4.10 TIX: 0.31 EDHREC RANK: 12038 (4/4) Artifact creatures and Heroes you control get +1/+1 for each Artificer you control and each Artificer card in your graveyard

Besides, how can people turn down an adorable bunny token