Each mana symbol counts as one word.
Each number counts as one word as well.
Each card name, when referenced inside the text, counts as one word too.
P/T and buffs should be broken in two: instead of posting 2/2, for example, you post just 2/ and the next person completes it as 2/2. Same for +1/+1 that becomes +1/ and then +1/+1.
Mardu Charm
Instant
Choose one —
• Mardu Charm deals 4 damage to target creature.
• Create two 1/ 1 white Warrior creature tokens.
Nexus