Board
Count only minions that can attack the enemy hero this turn. Frozen minions, summoning-sick minions, and minions blocked by taunt do not count yet.
Beginner checklist
Hearthstone lethal checklist for beginners
When you are new, lethal is easy to miss because every card asks for attention. This checklist gives you one repeatable scan before you click end turn.
Hand
Add direct damage, buffs, cheap pings, and charge-style damage from hand. Check mana before you add everything together.
Hero
Weapons, hero attack, hero power, and passive hero effects are common missed sources. Put them in their own bucket.
Blockers
Taunt, Divine Shield, armor, secrets, and lifesteal can change the route. Ask whether the damage reaches face after the blocker is handled.
Order
Enough damage still needs the right sequence. Buff before attacking, spell damage before spells, draw before committing if the deck has outs.
Confirm
Compare your final total against health plus armor. If the route is exact, spend one second checking whether one action breaks the rest of the turn.
The five-second version
Say: board, hand, hero, blocker, order. This is the core habit LethalCue is built around.