Crabvasion

Summon X 1/1 crab tokens to your opponents
field, and then apply the following effects. If X is higher than three the crabs have defender.
If X is higher that five the crabs are 0/1 instead.
If X is higher than nine the crabs have the ability
When an opponent attacks you, this must be used
to block if possible.
If X is higher than 14 you gain the emblem
You can sacrifice crab tokens your opponent
controls to deal 1 damage to its owner.