Valkyrie at 1 is dumb.
At 2 would make it useful.
But the problem is that 2 on field means that you can’t attack
Even 1 which forces you to attack Valkyrie is good mix it with intrigue shield or spike shield
Waste 2-3 card slots for inferior valkyrie? Hardpass. Rather summon dark magician while destroying a monster, tribute enemy cards to summon dark magician, summon dark magician for no cost and get a quick play graveyard card nullifier and a deck searcher that comes with banish control.