Sentry Bot
Artifact Creature — Robot
This spell costs less to cast for each creature attacking you.
When this creature enters, you get for each creature attacking you.
At the beginning of combat on your turn, you may pay . If you do, put a +1/+1 counter on each creature you control.
Legal in
Legacy, Vintage, Commander
Rulings (12)
The cost-reduction ability of Sentry Bot doesn’t change its mana cost or mana value, only the total cost you pay. Specifically, the mana value of Sentry Bot is always 5.
2024-03-08
Some spells and abilities that give you may require targets. If each target chosen is an illegal target as that spell or ability tries to resolve, it won’t resolve. You won’t get any .
2024-03-08
Once you announce that you’re casting Sentry Bot, no player may take actions until you’re done casting it. Notably, opponents can’t remove creatures from combat to try to change Sentry Bot’s total cost.
2024-03-08
Some triggered abilities that state that you “may pay” a certain amount of describe an effect that happens “If you do.” In that case, no player may take actions to try to stop the ability’s effect after you make your choice. If the payment is followed by the phrase “When you do,” then you’ll choose any targets for that reflexive triggered ability and put it on the stack before players can take actions.
2024-03-08