Sanctuary Lockdown — ruling 1

Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a Human you control may become lethal if Sanctuary Lockdown leaves the battlefield during that turn.

Sanctuary Lockdown — ruling 2

Since Sanctuary Lockdown’s activated ability doesn’t have a tap symbol in its cost, you can tap creatures that haven’t been under your control since your most recent turn began to pay the cost.

Sanctuary Lockdown : règles, fonctionnement et interactions (MTG)

Sanctuary Lockdown is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Humans you control get +1/+1. , Tap two untapped Humans you control: Tap target creature an opponent controls.

How it works : Sanctuary Lockdown

Original English text — Wizards of the Coast / Scryfall

#1April 17, 2020· Wizards of the Coast
Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a Human you control may become lethal if Sanctuary Lockdown leaves the battlefield during that turn.
No other card is named in this ruling.
#2April 17, 2020· Wizards of the Coast
Since Sanctuary Lockdown’s activated ability doesn’t have a tap symbol in its cost, you can tap creatures that haven’t been under your control since your most recent turn began to pay the cost.
No other card is named in this ruling.