Securitron Squadron (Surge Foil) [Fallout] Minotaur Cleric Set: Legends Type: Artifact Creature

Set: Legends Type: Artifact Creature — Shapeshifter Rarity: Rare Cost: {4} {0}: Change Sentinel's base toughness to 1 plus the power of target creature blocking or blocked by Sentinel

but it is sometimes also a matter of opportunity

Set: The Lost Caverns of Ixalan Type: Legendary Creature — Human Artificer Rarity: Mythic Cost: {U}{R} {U}{R}

If any of those cards shares a card type with the spell

Set: Mystery Booster Type: Creature — Sliver Rarity: Rare Cost: {3}{B} Whenever a Sliver deals combat damage to a creature

Securitron Squadron (Surge Foil) [Fallout] Minotaur Cleric Set: Legends Type: Artifact CreatureSet: Fallout Type: Artifact Creature Robot Rarity: Rare Cost: {1}{W} Squad 3 (As an additional cost to cast this spell, you may pay 3 any number of times. When this creature enters the battlefield, create that many tokens that are copies of it.) Vigilance Whenever a creature token enters the battlefield under your control, put a +1 +1 counter on it.