"Blocked or was Blocked By"
The sentence on that card is to be read as &quot;Exile target creature that (blocked or was blocked) by a Zombie this turn&quot;; parentheses mine. Both &quot;blocked&quot; and &quot;was blocked&quot; are linked to &quot;by a zombie&quot;. You can confirm that from the rulings at the bottom of the oracle page of Time to Reflect that you linked:

Time to Reflect only cares that the second creature was a Zombie at the moment it blocked or became blocked by the target creature. If that Zombie has become a non-Zombie creature or left the battlefield, Time to Reflect can still target the first creature.

The two other cards containing the phrase &quot;blocked or was blocked&quot; are Heat Stroke and Sea Troll. Heat Stroke in particular would not make sense if &quot;blocked&quot; and &quot;was blocked&quot; were not both connected to &quot;this turn&quot;, because &quot;blocked&quot; would not have any limitation in time. Similar for Sea Troll and Time to Reflect; if &quot;blocked&quot; was meant to stand alone, it would still contain some sort of time limitation, even if was something like &quot;this game&quot;.
As for your second question regarding Time to Reflect, it can only target creatures. A creature is any object on the battlefield whose card types includes &quot;creature&quot; and that has values for its power and toughness. A creature card in the graveyard or anywhere else but the battlefield is not a creature, therefore it's never a valid target for Time to Reflect. Whenever you read a combination of card types without additional qualifiers, such as &quot;creature&quot;, &quot;land&quot;, &quot;artifact enchantment&quot; and so on, that is always shorthand for a permanent of those types, i.e. &quot;creature permanent&quot;, &quot;land permanent&quot;, &quot;artifact enchantment permanent&quot;, and so on. Objects are permanents if and only if they are on the battlefield.

110.1. A permanent is a card or token on the battlefield. A permanent remains on the battlefield indefinitely. A card or token becomes a permanent as it enters the battlefield and it stops being a permanent as it’s moved to another zone by an effect or rule.
114.2. Only permanents are legal targets for spells and abilities, unless a spell or ability (a) specifies that it can target an object in another zone or a player, (b) targets an object that can’t exist on the battlefield, such as a spell or ability, or (c) targets a zone.