Casualty references an additional cost paid as the spell is cast
If a liquid gets spilled and you have only single sleeved your cards, then the liquid can get into the sleeve and damage cards, youll wish you had double sleeved them
Plus, its a creature thats fetchable off a Stoneforge Mystic or the new Cloud, Midgar Mercenary
Tundra Wolves Rarity: Common TYPE: Creature SUBTYPE: Wolf CMC: 1 Mana cost: USD: $1.19 EUR: 1.24 TIX: 0.00 EDHREC RANK: 21957 (1/1) First strike (This creature deals combat damage before creatures without first strike.) Typhoon Rarity: Rare TYPE: Sorcery SUBTYPE: - CMC: 3 Mana cost: USD: $17.46 EUR: 15.70 TIX: 0.00 EDHREC RANK: 29178 Typhoon deals damage to each opponent equal to the number of Islands that player controls
Also look out for cards that generate a stream of expendable tokens like Bitterblossom, and creatures whose value is not in staying on the battlefield but in entering it, like Bone Shredder
It ramps you, fixes your mana, provides a free artifact for its own metalcraft count, and any other effects in your deck that care about having a number of artifacts in play
