Arachnus Web
Enchantment — Aura
Enchant creature
Enchanted creature can't attack or block, and its activated abilities can't be activated.
At the beginning of the end step, if enchanted creature's power is 4 or greater, destroy this Aura.
Karl Kopinski
Magic 2012 (M12)
• #163Rulings
If the enchanted creature's power isn't 4 or greater when the end step begins, the last ability won't trigger at all.
(wotc • 2017-03-14)
Arachnus Web's triggered ability checks at the beginning of each end step, not just yours.
(wotc • 2017-03-14)
If Arachnus Web's last ability triggers, but the enchanted creature's power is reduced to 3 or less before the ability resolves, the ability will have no effect. Arachnus Web won't be destroyed.
(wotc • 2017-03-14)
Triggered abilities (starting with "when," "whenever," or "at") are unaffected.
(wotc • 2017-03-14)
If Arachnus Web enters the battlefield attached to an attacking or blocking creature (due to Arachnus Spinner's ability, for example), that creature will continue to attack or block.
(wotc • 2017-03-14)
Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder text.
(wotc • 2016-06-08)
Rulings
If the enchanted creature's power isn't 4 or greater when the end step begins, the last ability won't trigger at all.
(wotc • 2017-03-14)
Arachnus Web's triggered ability checks at the beginning of each end step, not just yours.
(wotc • 2017-03-14)
If Arachnus Web's last ability triggers, but the enchanted creature's power is reduced to 3 or less before the ability resolves, the ability will have no effect. Arachnus Web won't be destroyed.
(wotc • 2017-03-14)
Triggered abilities (starting with "when," "whenever," or "at") are unaffected.
(wotc • 2017-03-14)
If Arachnus Web enters the battlefield attached to an attacking or blocking creature (due to Arachnus Spinner's ability, for example), that creature will continue to attack or block.
(wotc • 2017-03-14)
Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder text.
(wotc • 2016-06-08)