The effect making the land an Island doesn’t have a duration and will last indefinitely. The land retains any land types and abilities it already had. An Island has the ability “T: Add U.”
So yes, the effect will last as long as the land is on the battlefield, even if the Monster leaves play.
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DCI Level 2 Judge
Scientists have calculated that the chance of anything so patently absurd actually existing are millions to one. But magicians have calculated that million-to-one chances crop up nine times out of ten.
Also, to maybe make it a little more clear: if the effect had a duration it would include a clause like "for as long as you control sealock monster" or "until sealock monster leaves the battlefield"
Do note that unlike other such effects, Sealock says 'in addition to its other types' so the land does what it normally does and additionally can tap for blue.
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Sealock Monster
So yes, the effect will last as long as the land is on the battlefield, even if the Monster leaves play.
Scientists have calculated that the chance of anything so patently absurd actually existing are millions to one. But magicians have calculated that million-to-one chances crop up nine times out of ten.
W(W/U)U Ephara - Flash & Taxes W(W/U)U || B(B/G)G Meren - Circle of Life B(B/G)G
RGW Marath - Ever shifting Wilds RGW || (U/R)C(W/B) Breya - Artificial Dominion (U/R)C(W/B)
UBR Becket Brass - take what you can, give nothing back UBR