Chronicles Foreign Black Border

Sentinel

{0}: Change Sentinel's base toughness to 1 plus the power of target creature blocking or blocked by Sentinel. (This effect lasts indefinitely.)

Chronicles

When Sentinel comes into play, its toughness is equal to 1.
o0: Change Sentinel's toughness to 1 plus the power of target creature blocking or blocked by Sentinel.

Legends

The * in the lower right hand corner is 1 when cast. While blocking, you may choose to change * to equal one plus the power of target creature sentinel blocks this turn. While attacking, you may choose to change * to equal one plus the power of target creature that blocks Sentinel this turn.