Dualcaster Mage is the easier card to go infinite with, since it doesn't require being cast to copy spells like Ghostly Flicker, though the otters still great as just a body that doubles up on another spell you're casting
Storm is this cards best friend in formats like Commander, but multiple copies in Standard and Pioneer makes each individual spell dole out additional Poison (and Modern gets the best of both worlds)
Im absolutely certain that testing for this kind of stuff is pretty much impossible to do, but with Companions being overwhelming a while ago, and a slew of other bannings and missteps in the last year or so, it can really feel as though things are going wrong
Finally, the -3 on Ajani deals four damage to each creature except for tokens you control
There are more than 400 creatures with lifelink in Magic, split across all colors of the game
The premium tends to be largest for SAR and illustration rare cards (30-40%) and smaller for standard SRs (15-25%)