The right play is going to depend on the matchup (if they're a very fast deck it could be right to block), your hand (if your next play is a Ghoulraiser and your creature is instead a Walking Corpse, it is excellent to block), and your tribe along with your deck
The vigilance is also very notable, as this lets you attack with your mana rocks and also use them for mana after the attack
Our own Jason Alt already built a deck around him which you can check out here - Saruman's Caress of Steal | Article by Jason Alt (coolstuffinc.com)
They dont have ward 2, unlike disguised or cloaked cards
Card Name Mana Cost Type Legendary Creature - Bison Ally Rarity Uncommon rules Text Flying (This creature can't be blocked except by creatures with flying or reach.) Whenever Appa attacks, another target attacking creature without flying gains flying until end of turn
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