Sentinel

Enchant creature Enchanted creature gets +1/+0. RRR: Regenerate enchanted creature.

Enchant creature Enchanted creature gets +3/+3.

All lands are 1/1 creatures that are still lands.

1G, T: Target creature gets -2/-0 until end of turn.

Banding (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.) T: Counter target activated ability from an artifact source unless that ability's controller pays W. (Mana abilities can't be targeted.)

At the beginning of your upkeep, put a pin counter on this artifact. At the beginning of your end step, if this artifact is untapped, destroy this artifact and it deals damage to you equal to the number of pin counters on it. XX, T: This artifact deals damage equal to the number of pin counters on it to any target. X is the number of pin counters on this artifact.

Whenever an opponent casts a creature spell that doesn't share a color with a creature you control, counter that spell unless that player pays X, where X is its mana value.

Enchant creature Whenever enchanted creature deals damage to you, this Aura deals that much damage to that creature's controller.