Aphetto Alchemist Cat-Owl Clock of Omens Corridor Monitor Dee Kay, Finder of the Lost Dross Scorpion Elder Druid Filigree Sages Galvanic Key Hyperion Blacksmith Iceberg Titan Infuse Janjeet Sentry Jolt Magus of the Unseen Mind Over Matter Mirran Spy Nature's Chosen Sewer-veillance Cam Staff of Domination Tezzeret, Cruel Captain Trickster Mage Twiddle Twitch Voltaic Construct Voltaic Key Voltaic Servant
If it is an aura deck specifically (and the target creature does not have summoning sickness), you immediately get a 4-in-1 or 5-in-1 as early as turn two or turn three
Criteria: Non-creature, non-land cards within the Jeskai color identity that can grant double strike to all creatures you control
Its got Trample, which is a neat way to cause some damage, but its the second part of its abilities that will cause the most impact
A few notable cards it pairs with for 2-card infinite combos include: #40
If you see a large creature and a removal spell, you can choose which card becomes your hidden threat and which card goes to the graveyard