Your opponent will have to be in a very good position in terms of creatures and available mana to be able to attack you without losing at least some amount of life
Can't get enough of the artwork
The combo involves Rosie and Scurry Oak
Scrabbling Skullcrab and Victor, Valgavoths Seneschal are particularly good options, since they top up your yard each time you re-cast Servitude
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However, if a single creature you control with lifelink deals combat damage to multiple creatures, players, and/or planeswalkers at the same time (perhaps because it has trample or was blocked by more than one creature), the ability will trigger only once